Endocardium of Sheep Heart
The endocardium is made up of simple squamous endothelium and a little bit of connective tissue. Beneath this layer are
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Author: dgroga01
Small Muscular Artery in the Heart. Cross Section.
A small muscular artery in the heart, specifically, in the moderator band. Notice the three layers of the vessel: intima,
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Small Muscular Artery in the Heart. Longitudinal Section.
A small muscular artery in the heart, specifically, in the moderator band. Notice the three layers of the vessel: intima,
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Purkinje Fibers at Higher Magnification. Longitudinal Section.
Higher magnificantion of the Purkinje fibers in longitudinal section. The cytoplasm of the cells used to contain a lot of
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Regular Cardiac Muscle Cells. Cross Section
Compare these regular cardiac muscle fibers with the Purkinje fibers in other micrographs. These cells are smaller, darker staining and
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Purkinje Fibers in the Moderator Band. Cross Section.
Higher magnificantion of the Purkinje fibers in cross section. The cytoplasm of the cells used to contain a lot of
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Purkinje Fibers in the Moderator Band. Cross Section.
Compare the size and staining property of the Purkinje fibers with those of the regular cardic muscle fibers. The Purkinje
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Purkinje Fibers in the Moderator Band. Longitudinal Section.
Compare the size and staining property of the Purkinje fibers with those of the regular cardic muscle fibers. The Purkinje
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Purkinje Fibers in the Moderator Band. Longitudinal Section.
The moderator band, found in the right ventricle, contains bundles o Purkinje fibers. This is a longitudinal section of part
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Purkinje Fibers in the Moderator Band. Cross Section.
The moderator band, found in the right ventricle, contains bundles o Purkinje fibers. This is a cross section of the
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Vena cava of the horse with longitudinal smooth muscle bundles
Organ: Vena cava, Species: Horse. Comments: Cross section of the vena cava. Notice that the smooth muscle cells are arranged
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Vena cava of the horse
Organ: Vena cava, Species: Horse. Comments: Cross section of the vena cava. Notice that the smooth muscle cells are arranged
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Tangential and longitudinal profile of a small artery in the rumen of a goat
Organ: Forestomach, Tissue: Artery, Species: Goat. Comments: Most of the smooth muscle cells in the tunica media of this artery
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Smooth muscle wall of a small artery in the rumen of a goat
Organ: Forestomach, Tissue: Artery, Species: Goat. Comments: Longitudinal section of a small artery found in the fatty tissue of a
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Longitudinal and tangential profiles of a small artery in the rumen of a goat
Organ: Forestomach, Tissue: Artery, Species: Goat. Comments: Longitudinal section of a small artery found in the fatty tissue of a
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Longitudinal section of a small artery in the rumen of a goat
Organ: Forestomach, Tissue: Artery, Species: Goat. Comments: A small artery found in the fatty tissue of a goat’s forestomach.
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Small artery and vein in the fatty tissue of a goat’s forestomach
Organ: Forestomach, Tissue: Artery / Vein, Species: Goat. Comments: Small artery and vein. Compare their sizes, thickness and the composition
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Artery and vein in the forestomach of a goat.
Organ: Forestomach, Tissue: Artery / Vein, Species: Goat. Comments: Small arteries and vein. Compare their sizes, thickness and the composition
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Higher magnification of secretory acini in lactating mammary gland.
The secretory acinus of the mammary gland is like a basket suspended in a net. The secretory epithelium is cuboidal.
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Mammary gland with interlobular duct, lactating.
The lumens of the secretary acini are filled with eosinophilic material (milk)in this section. Some of the acini have fused
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Lactating mammary gland from a cat.
The mammary gland is a compound tubuloalveolar gland. The secretory parenchyma is divided into lobes and then lobules by connective
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Glandular area of the endometrium.
The surface of the endometrium is covered by a columnar/pseudostratified columnar epithelium. Coiled glands extend into the stroma (except in
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Uterine horn of sheep with caruncles.
This is a low power picture of the uterine horn from a sheep. The endometrium has caruncles and glandular regions.
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Epithelium of ovdicut mucosa.
The epithelium of the oviduct mucosa contains two major cell types, ciliated and secretory. The ciliated cells are columnar in
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Oviduct at low power.
The oviduct or uterine tube is also known as the Fallopian tube. It has the typical layers of a hollow
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Higher magnification of a corpus albicans.
At higher magnification, the corpus albicans looks a bit like pink cotton candy. There is an abundance of connective tissue
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Corpus albicans at low power.
The corpus luteum has a finite lifespan. Eventually it will degenerate and becomes a scar-like structure called the corpus albicans
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Corpus luteum, low power.
This low power micrograph shows part of a corpus luteum. The atrium and the fluid inside has disappeared as the
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Corpus luteum, recent.
This is a low power micrograph of an ovary which contains a recently formed corpus luteum. The Graafian follicle, prior
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Mature and immature follicles. A size comparison.
In this low power picture of the ovary (8x) you can see the relative sizes of two mature secondary follicles
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Cumulus oophorus in a secondary follicle.
In the antrum of this secondary follicle the follicular liquor formed a precipitate and stained eosinophilic. The oocyte has reached
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Secondary follicle with large antrum.
The antrum of this secondary follicle is quite large. Some of the proteins in the follicular liquor stained light pink.
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Secondary follicle with antrum.
As the secondary follicle grows under the influence of FSH and increases in size, fluid (follicular liquor) accumulates between the
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Secondary follicle with small antrum.
As the secondary follicle grows under the influence of FSH and increases in size, fluid (follicular liquor) accumulates between the
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Secondary follicle in the ovary of a cat.
As the follicle develops, the oocyte becomes larger. The follicular cells proliferate and the oocyte is surrounded by stratified polyhedral
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Primary follicle in feline ovary.
The primary follicle contains an oocyte surrounded by a single layer of cuboidal epithelial cells which sit on a basal
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Primordial follicles in feline ovary.
Beneath the surface epithelium of the ovary is a thick layer of dense connective tissue, the tunica albuginea. The primordial
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Ovary at low power.
This is a low power micrograph of the surface of a feline ovary. The ovary is divided into a cortex
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Urothelium 4
Urothelium 4 Schematic illustration of the location of luminal and intraepithelial asymmetric unit membrane in distended (top)and contracted (bottom)urothelium.
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Urothelium 3
Urothelium 3 Low and high magnification photomicrograph of canine urinary bladder stained with an antibody against uroplakin. Note that the
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Urothelium 2
Urothelium 2 Free-fracture of luminal membrane of canine bladder urothelium showing polygonal plaques of hexagonally packed particles. The protein that
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Urothelium 1
Urothelium 1 Thin section electron micrograph of luminal plasma membrane of superficial cell of dog urinary bladder. The outer leaflet
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Urinary Bladder and Urothelium
Urinary Bladder and Urothelium Joseph Alroy, D.V.M. The urinary bladder is an organ that has to change its luminal volume.
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Ureter of Horse
Low power micrograph of the ureter from a horse. This is a typical hollow organ. The mucosa contains the transitional
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Medulla of the kidney with collecting ducts.
Cuboidal cells of the collecting duct are characterized by clear cytoplasm and distinct lateral cell margins.Thin segments (wider lumens) and
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Collecting ducts in kidney medulla.
In a longitudinal section, the cuboidal nature of the cells in the collecrting duct is quite obvious. The other features
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Kidney medulla with collecting ducts.
In a longitudinal section, the cuboidal nature of the cells in the collecrting duct is quite obvious. The other features
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Cortex of feline kidney.
This slide was stained with PAS-hemotoxylin. Note the bright staining of the basal lamina surrounding the tubules as well as
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Glomerulus with vasculoar and urinary poles.
In one of the two renal corpuscles in this section you can see both the vascular pole and the urinary
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Glomerulus, Convoluted tubules and Blood Vessels
The glomerulus is made up of a capillary plexus. Here you can see the red blood cells in the capillaries.
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Papillary ducts in the renal medulla of a dog.
This micrograph was taken close to the area cribrosa of the renal papliia. The lateral plasma membranes of the epithelial
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Glomerulus in the kidney of a golden retriever
In this renal corpuscle you can see both the vascular and the urinary poles. Some of the capillaries in the
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Mucous Glands in Horse Kidney
These glands secrete mucous into the urine and gives it a “stingy” character. Original mag. 13x H&E. Mucous glands. Renal
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Mucous Glands in Horse Renal Pelvis
The “stringy” nature of equine urine is due to the secretion of these mucous glands in the kidney. Original mag.
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Transitional Epithelium in the Urinary Bladder of Boar at Higher Magnification
The transitional epithelium of an empty urinary bladder contains several layers of cells. The cells at the apical surface may
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Transitional Epithelium in the Urinary Bladder of Boar
The transitional epithelium of an empty urinary bladder contains several layers of cells. The cells at the apical surface may
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Urinary Bladder of Boar
The lumen of an empty bladder is thrown into folds as seen here. The transitional epithelium appears as several cell
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Urinary Bladder of Boar
The lumen of an empty bladder is thrown into folds as seen here. The transitional epithelium appears as several cell
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Centroacinar Cells in Exocrine Pancreas
The first portion of the intercalated duct in the exocrine pancreas begins with the centroacinar cells which are found in
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Intercalated Ducts in Exocrine Pancreas
The first part of the excretory duct from the acini of the exocrine pancrease is called the intercalated duct. It
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Pancreas of Mouse
The exocrine portion of the pancrease is made up of clusters of secretory acini and the associated ducts that drain
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Pig Liver with Portal Triad
The bile produced by hepatocytes collect in bile canaliculi. At the periphery of the lobule the bile flows into the
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Portal Triad in the Liver of a Pig
The abundant connective tissue in the liver of the pig divides the organ intt easily recognizable “classic lobules”. The portal
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Tip of Villus from Small Intestine
Tip of a villus from the jejunum of a dog. There is some separation artifact at the junction between the
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Central Lacteal in a Villus
Cental lacteal in the core of a villus. The lacteal is part a blind-ended lymphatic vessel and is involved in
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Glands of the Canine Anal Sac. higher Magnification.
In the dog, the glands of the anal sac (sinus paranales) are large aprocrine sweat glands. They are prone to
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Anal Glands, Circumanal Glands, Anal Sac Glands
This low magnification micrograph shows the anal canal area of a dog. A variety of glands are included here but
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Glands of the Anal Sac
Glands of the anal sac from a dog. PK1636. J11a. H&E. Original mag. 10x. Anal sac. Glands of anal sac.
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Recto-Anal Junction
Recto-anal junction in the dog. The rectal area is covered by colonic mucosa. The anal canal is covered by stratified
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Mitosis in the Bottom of Intestinal Crypts
The epithelium of the GI tract is replaced on a regular basis. In the intestine mitosis takes place in the
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Villi from Canine Small Intestine
Villi from the jejunum of a retriever. PK0576. H&E. Original mag. 33x. Jejunum. Samll intestine. Digestive System. Dog.
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Jejunum at Low Power
Jejunum of a retriever at low magnification. Note the villi and the crypts. PK0574. H&E. Original mag. 13x. Jejunum. Small
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PAS Stained Duodenal Villi
Tip of villi from the duodenum of a dog. The mucus in the goblet cells stained brightly. The lamina proria
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Duodenum with Brunner’s Glands, PAS Stained
This section was stained with PAS. Notice the mucus in the goblet cells stained differently from that of the Brunner’s
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Higher Magnification of the Duodenum from a Dog
At this magnification you can clearly see the cells that make up the Brunner’s glands. Notice the size, shape and
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Duodenum of Dog with Brunner’s Glands
A medium power micrograph of the duodenum from a dog. J8. PK1624 PTAH. Original mag. 25x. Brunner’s glands. Duodenum. Small
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Duodenum at Low Power
Duodenum at low power showing the villi, the crypts and the Brunner’s glands. Note the location of the muscularis mucosae.
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Smooth Muscle “Core” in the Lamina of the Omasum
The “core” of the omasum contains three bundles of smooth muscles. Two are from the muscularis mucosae while the central
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Lamina in the Omasum of a Goat, Medium Power
At this magnification you can make out the three bands of smooth muscles in the core of the lamina. There
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Part of the Omasum from a Goat
Omasum at low power. You can make out the bands of smooth muscles in the middle of the lamina. Surgical
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Omasum of a Goat
The omasum is part of the forestomach of a ruminant (the rumen and reticulum are the other parts). It contains
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Tip of a Reticulum Fold in the Forestomach of a Cow
In a long fold of the reticulum, a mass of muscularis mucosae is found in the upper segment of the
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Reticulum in the Forestomch of a Cow
This is a mucosal fold of the reticulum. At the tip of the fold is the muscularis mucosae in the
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Surface Epithelium of a Papilla in the Rumen of a Goat
The surface epithelium is stratified squamous keratinized. The core is made up of connective tissue and blood and contains a
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Tip of a Papilla in the Rumen of a Goat
Tip of a papilla in the rumen of a goat. The surface epithelium is of the keratinized stratified type. The
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Two Papillae in the Rumen of a Goat
Two papillae in the rumen of a goat. Each papilla has a keratinized stratified epithelium over a core of connective
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Rumen of Goat
The rumen is the first part of the forestomach (reticulum and omasum are the other two). It is lined by
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Parietal and Chief Cells of the Fundic Stomach
The parietal cells of the fundic stomach stain eosinophilic due to the large number of mitochondria in the cytoplasm. These
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Canine Fundic Stomach
Fundic stomach of a dog showing surface mucous cells and some chief cells. PK0080. 2966-115. H&E. Original mag. 50x. Fundic
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Margo plicatus in horse, higher magnification.
At the margo plicatus the nonglandular, stratified squamous epithelium of the forestomach ends, and the simple columnar epithelium of the
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Non-glandular Portion of Horse Stomach, Margo Plicatus
At the margo plicatus the nonglandular, stratified squamous epithelium of the forestomach ends, and the simple columnar epithelium of the
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Nonglandular Portion of Equine Stomach, The Margo Plicatus
In some animals, in addition to the glandular portion, there exists a nonglandular region of the mucosa lined with stratified
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Mucous Glands in the Submucosa of Canine Esophagus
Mucous glands in the submucosa of the esophagus in a dog. In the dog these glands are found throughout the
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Medium Power Micrograph of Esophagus
The sophagus is lined with stratified squamous epithelium. The pale-staining mucous glands are located in the submucosa. 2966-106. PK0062. H&E,
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Low Power Micrograph of the Esophagus
Low power picture of the esophagus showing the submucosal mucus glands. CD2966-105. PK0061. H&E.Esophagus. Digestive System.
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Fungiform Papillae with Taste Buds
In this higher magnification of a fungiform papilla, you can see the lighter-staining taste bud at the apical surface of
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Fungiform Papillae of the Tongue
The fungiform papillae look like little mushrooms. There are covered by stratified epithelium and contain taste buds on their superior
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Filiform Papillae on the Surface of a Monkey’s Tongue
The epithelium on the surface of the tongue has specializations called papillae. The one seen here are the most common
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Tongue of Monkey, Proximal Portion
In this micrograph of the proximal portion of the tongue from a young monkey, you can see the large papillae
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Tongue of Monkey, Middle Portion
The middle portion of the tongue from a young monkey. There are numerous papillae on the superior surface of the
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Tongue of Young Monkey, Distal Portion
Tip of tongue from a young monkey. Notice the papillae on the superior surface of the tongue. Surgical no. 00-163816.
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Liver Lobule in Horse Containing the Portal Triad.
The hepatic portal vein in this picture is large, round and ‘open’ in appearance here. Thecells forming the bile ducts
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Liver Lobule in Horse Showing the Portal Triad.
The portal triad is located in variable amount of connective tissue. The largest structure is the hepatic portal vein (which
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Centralacinar Cells in Exocrine Pancreas of Mouse.
The secretory portion of the exocrine pancreas starts in the middle of the acinus and is formed by centroacini cells.
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Centroacinar Cells in Exocrine Pancreas of Mouse.
The exocrine portion of the pancreas is made up of acini, ducts and connective tissue. Each acinus is made up
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Exocrine Pancreas of Mouse.
Pancreas of mouse showing both the exocrine portion and the endocrine portion. Notice the ducts in the connective tissue which
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Pancreas of Mouse.
The stomach of the mouse contains a non-glandular and a glandular portion. The non-glandular portion is made up of stratfied
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Squamous Portion of Murine Stomach.
The stomach of the mouse contains a non-glandular and a glandular portion. The non-glandular portion is made up of stratfied
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Glandular Epithelium of Mouse Stomach.
The glandular epithelium of the fundic stomach in the mouse contains branching gastric glands. The most obvious cells are the
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Fundic Stomach of Mouse.
The stomach of the mouse has a glandular and non-glandular portion. The non-glandular portion is made up of stratified squamous
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Stomach of Mouse. Glandular and Non-glandular Portions. Higher magnification.
The stomach of the mouse has a glandular and non-glandular portion. The non-glandular portion is made up of stratified squamous
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Stomach of Mouse. Glandular and Non-glandular Portions. Low magnification.
The stomach of the mouse contains a squamous and a glandular portion. One one sideof the slide is the stratified
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Stomach of Mouse. Glandular and Non-glandular Portions. Low magnification.
The stomach of the mouse contains a squamous and a glandular portion. One one sideof the slide is the stratified
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Another Sectioning Artifact
Another tangential section of the respiratory epithelium gives the impression that this protion of the epithelium contains many layers of
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Sectioning Artifact, Respiratory Epithelium
A tangential section of the respiratory epithelium gives the impression that this protion of the epithelium contains many layers of
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B.A.L.T. Bronchus Associated Lymphoid Tissue
All along the respiratory tract you will find various aggregated of lymphoid tissues. These form the B. A. L. T.,
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Visceral Pleura
The visceral pleura is made up of a simple squmous/cuboidal epithelium (the mesothelium) and some connective tissues beneath it. Small
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Bronchial Artery
This is a micrograph of an inrapulmonary bronchus (cartilage islands, muscularis mucosae, submucosal glands). There are several bronchial blood vessels
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Another “Three Ring Circus” in the Bovine Lung
In the bovine lungs, the pulmonary artery, pulmonary vein and the conducting airway run together and share the same connective
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Pulmonary Vein, Artery and Bronchus in Calf
In the calf, the pulmonary artery and vein are found at opposite sides of the conducting air passage, in this
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Small Pulmonary Vein
Small pulmonary vein with thin wall (low pressure) and thin layer of connective tissue in adventitia. It is surrounded by
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Terminal Bronchiole, Respiratory Bronchiole, Alveolar Duct
The picture can be divided into three parts. On the right is a portion of a bronchiole with its associated
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Clara Cells in Bronchiole Wall
The epithelium in this portion of the bronchiole contains many Clara cells. They are cuboidal cells with round nuclei and
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Wall of Bronchiole at Higher Magnification
If you look at the epithelium carefully, you will see that there are three main types of cells present. The
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Wall of Bronchiole
Low power picture of the wall of a bronchiole. The smooth muscles making up the muscularis mucosae are clearly seen.
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Bronchiole, Low Power
This is a lower power picture of a bronchiole. Notice the lack of cartilage pieces in the adventitia. If they
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Respiratory Epithelium in Intrapulmonary Bronchus
This is a pseudostratified ciliated columnar epithelium with goblet cells. The tufts of cilia can be seen along with the
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Another Section of Intrapulmonary Bronchus
The presence of muscularis mucosae, submucosal glands, and cartilage pieces together leads to the deduction that this is a picture
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Wall of an Intrapulmonary Bronchus
At this magnification, it is difficult to make out the cilia at the tip of the ciliated cells in this
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Bronchus, Intrapulmonary
This is a slightly lager picture of the intrapulmonary bronchus. Notice the mucous film in the lumen. This is part
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Intrapulmonary Bronchus and Pulmonary Artery
This picture shows an intrapulmonary bronchus and the pulmonary artery that runs with it. The epithelium of the mucosa is
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Trachea of a Cat at Medium Power
This is from the trachea of a cat at medium power. The globules of mucus in the goblet cells stain
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Trachea of a Cat
This is from the trachea of a cat at low power. The mucus in the goblet cells stain light blue.
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Sinus hair follicle from a dog.
Sinus or tactile hair follicle is specialized for tactile sense. Each is a single follicle which is much larger than
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Digital pad of the dog.
The digital pad of the dog contains thick stratified squamous keratinized epithelium. The cellular layers of the epidermis and the
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Digital pad of the dog, higher mag.
This section shows the stratum spinosum, the stratum granulosum and the stratum lucidum of the thick skin in the foot
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Thick skin from a dog.
This micrograph spans most of the layers of the thick skin. In one corner is the stratum basalis while in
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Compound hair follicle in dog.
Several hair follicles cluster together in the dermis to form compound hair follicle. Usually there is a primary hair follicle
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Aprocrine sweat glands in a dog.
The aprocrine sweat glands have a secretory portion and a ductal portion. The epithelium of the secretory portion contains cuboidal
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Canine sebaceous glands.
The sebacous glands secrete an oily substance, sebum, which acts as an antibacterial agent and, in hairly mammals, as a
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Lymph node of horse with melanoma.
Organ: Lymph node. Comments: Malignant melanoma cells from the skin of a horse have metastasized to a lymph node.
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Skin of horse with melanoma
Organ: Skin, Species: Horse. Comments: Melanoma in skin of a horse. Numerous malignant melanocytes have infiltrated all layers of the
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Sebaceous glands in the skin of horse
Organ: Skin, Species: Horse, Comments: The secretory cells in the sebaceous glands have pale, vacuolated cytoplasm. The smaller, flatter cells
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Epidermis of horse
Organ: Skin, Species: Horse. Comments: Epidermis of horse. Stratified squamous keratinized epithelium. Keratinocytes with melanin pigment
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Skin of horse with sebaceous glands and hair follicles
Organ: Skin, Species: Horse. Comments: Skin of horse with simple hair follicles, sebaceous glands and parts of seat glands.
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Stratified squamous keratinized epithelium and hair follicles in equine skin
Organ: Skin, Species: Horse. Comments: Skin of horse with stratified squamous keratinized epithelium and hair follicles.
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Skin of horse with simple hair follicles
Organ: Skin, Species: Horse. Comments: Skin of horse showing surface epithelium, hair follicles and sebaceous glands. Simple hair follicles occur
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Corpus Spongiosum, Monkey Penis
The corpus spongiosum is surrounded by a thin tunica albugina (not included in this micrograph). The penile urethra is located
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Comparison of Corpora Cavernosa & Corpus Spongiosum
The erectile cylinders are bound by connective tissue sheath — the tunica albugina. The t.a. of the corpora cavernosa is
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Penis of a Pig, Low Power
Low power micrograph of the penis from a pig. The three erectile cylinders are bound by connective tissue layers (tunica
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Seminal Vesicle, Low Power, Primate
The SV has an elaboratly folded mucosa that appears to have “blind pockets”. These spaces, in actuality, communicate with the
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Ductus Epididymis, Higher magnification, Dog
Here you can make out the seterocilia. However, it may be difficult to tell exactly what these structures are made
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Ductus Epididymis, Low Power, Dog
Low power micrograph of epididymis from a dog. This is a long tubular structure that is highly coiled and compact.
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Primary Spermatocytes
The primary spermatocytes have moved away from the basal lamina. They undergo the first meiotic division. The prophase is fairly
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Spermatogonia, Primate Seminiferous Epithelium
The spermatogonia are located on the basal lamina of the seminiferous epithelium. Some of them have round nuclei while others
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Secretory Acini in Bulbourethral Gland of the Boar
The cells in the secretroy acini of the bulbourethral gland have basophilic cytoplasm. They secrete a viscous material rich in
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Bulbourethral Gland of a Boar
The cells in the secretroy acini of the bulbourethral gland have basophilic cytoplasm. They secrete a viscous material rich in
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Higher Magnification of Leydig Cells in the Testis of a Boar
The Leydig cells are involved in the production of the male steroids. They have eosinophilic cytoplasm with lipid droplets. Between
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Leydig cells in the testis of a boar.
The Leydig cells are found in the interstitial tissue of the testis. They are involved in te production of the
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Leydig cells in the testis of a boar.
The Leydig cells are found in the interstitial tissue of the testis. They are involved in te production of the
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Pseudostratified Epithelium in the Epididymis of the Boar
This is a pseudostratified stereociliated columnar epitheliumwith basal reserve cells. The stereocilia are long, nonmotile microvilli that are inolved in
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Epididymis of the Boar
This micrograph of the epididymis from a boar shows a single crossectional profile of this organ which is actually a
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Epididymis of the Boar at Low Power
This low power micrograph of the epididymis from a boar shows multiple crossectional profiles of this organ which is actually
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Bulbourethral Gland of a Boar
The bulbourethral gland secrets a viscious liquid rich in sialoproteins. This may serve as a lubricant for the urethra. The
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Epididymis of Boar
The epididymis is a single tube-like structure line with pseudostratified stereociliated columnar peithelium with basal cells. The tube is highly
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Interstitial cells of Leydig in the canine testis
Organ: Testis, Tissue: Leydig cells, Species: Dog. Comments: A cluster of interstitial cells of Leydig is surrounded by seminiferous tubules
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Autonomic ganglion in the adrenal gland of the dog
Organ: Adrenal, Tissue: Autonomic ganglion, Species: Dog. Comments: Parasympathetic ganglion with numerous basophilic neuronal cells in the adrenal of a
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Myenteric plexus of Auerbach in the canine stomach. High power
Organ: Stomach, Tissue: Myenteric plexus of Auerbach, Species: Dog. Comments: The myenteric plexus of Auerbach is found between the two
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Myenteric plexus of Auerbach in the canine stomach. Low power
Organ: Stomach, Tissue: Myenteric plexus of Auerbach, Species: Dog. Comments: The myenteric plexus of Auerbach is found between the two
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Parasympathetic ganglion cells in the adrenal gland of the horse
Organ: Adrenal, Tissue: Autonomic ganglion, Species: Horse. Comments: Parasympathetic ganglion associated with the adrenal gland. The neuronal cell bodies have
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Autonomic ganglion in the adrenal gland of the horse
Organ: Adrenal, Tissue: Autonomic ganglion, Species: Horse. Comments: Parasympathetic ganglion associated with the adrenal gland.
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Parafollicular cells anong thyroid follicles.
The calcitonin secreting C-cells (parafollicular) cells have pale cytoplasm and are found between the follicules. Note the amount of cytoplasm
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Canine pituitary gland containing adeno- and neuro-hypophysis.
This section contains the pars distalis, the pars intermedia, reamins of Rathke’s pouch, and the pars nervosa. The pars distalis
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Herring bodies in the neurohypophysis of a dog.
The nuclei seen in this section of the neurohypophysis belong to the supportive cells. The cell bodies of the unmyelineated
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Low Power Micrograph of Canine Pituitary.
This section contains the pars distalis, the pars intermedia, reamins of Rathke’s pouch, and the pars nervosa. The pars distalis
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Junction Between Z. Reticularis and the Medulla
The cells of the zona reticularis produce small amounts of sex hormones. Being steroid synthesising and metabolizing cells, they have
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Immunohistochemical Staining of Parafollicular Cells.
The C-cells/parafollicular cells are found detween the follicles. This is a picture of immunohistochemical staining using an antibody against calcitonin.
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Islet of Langerhans in canine pancreas at higher magnification
Organ: Pancreas, Tissue: Islet of Langerhans, Species: Dog. Comments: Several secretory cell types, plus a network of capillaries makes up
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Islet of Langerhans in canine pancreas
Organ: Pancreas, Tissue: Islet of Langerhans, Species: Dog. Comments: Islets of Langerhans are endocrine structures that occur as clusters of
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Acidophils in the pars distalis of the canine pituitary
Organ: Pituitary, Tissue: Pars distalis, Species: Dog. Comments: A few chromophobes are found among the numerous acidophils.
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Canine adrenal cortex with zona glomerulosa and zona fasciculata
System: Endocrine, Organ: Adrenal, Tissue: Cortex. Species: Dog. Comments: Low power micrograph of dog adrenal cortex including the zona arcuata
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Thyroid follicles from a Canadian goose
Organ: Thyroid, Species: Avian (Canadian goose). Comments: The thyroid contains numerous follicles of various sizes. The colloid inside the follicles
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Thyroid gland of Canadian goose
Organ: Thyroid, Species: Avian (Canadian goose). Comments: Low power micrograph showing numerous follicles.
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Canine pars distalis with acidophils
Organ: Pituitary, Tissue: Pars distalis, Species: Dog. Comments: The majority of the cells in this micrograph are acidophils. The rest
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Canine adrenal cortex
Organ: Adrenal, Tissue: Cortex, Species: Dog. Comments: Adrenal cortex with capsule. The cells in the outermost zone of the cortex
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Cortex-Medulla junction in the adrenal gland of the horse
Organ: Adrenal, Tissue: Cortex-Medulla junction, Species: Horse. Comments: Junction between the zona reticularis and the medulla in horse adrenal. The
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Zona fasciculata in the adrenal cortex of the horse
Organ: Adrenal Cortex, Tissue: Zona fasciculata, Species: Horse. Comments: The cells of the zona fasciculata are vacuolated due to the
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Adrenal cortex of the horse showing the three zones
Organ: Adrenal, Tissue: Cortex, Species: Horse. Comments: Low power micrograph showing zona glomerulosa, fasciculata and reticularis. Cells in the zona
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Zona glomerulosa in the adrenal cortex of the horse
Organ: Adrenal, Tissue: Zona glomerulosa, Species: Horse. Comments: The cells in the zona glomerulosa are arranged in high arcs. The
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Parathyroid gland of the horse
Organ: Parathyroid, Species: Horse. Comments: Parathyroid gland of the horse. Small cluster of eosinophilic oxyphils are scattered the more numerous
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Parathyroid gland of the horse at low power
Organ: Parathyroid Species: Horse. Comments: Low power micrograph of the parathyroid gland with a small portion of the thyroid also
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Pars intermedia in the pituitary of the horse with remains of Rathke’s pouch
Organ: Pituitary, Tissue: Pars intermedia, Species: Horse. Comments: Pars intermedia, remains of Rathke’s pouch and part of pars distalis. In
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Neurohypophysis of the horse with nerve fibers and pituicytes
Organ: Pituitary, Tissue: Pars nervosa, neurohypophysis, Species: Horse. Comments: Numerous unmyelinated axons of secretory neurons are seen here. The cell
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Adenohypophysis (pars distalis) of the horse with many acidophils
Organ: Pituitary, Tissue: Pars distalis, adenohypophysis, Species: Horse. Comments: Numerous acidophiles are present. They stain bright orange in an H&E
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Adenohypophysis of the horse with acidophils
Organ: Pituitary, Tissue: Pars distalis, adenohypophysis, Species: Horse. Comments: Numerous acidophiles are present. They stain bright orange in an H&E
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Pituitary gland of the horse showing the three main parts at medium magnification
Organ: Pituitary, Species: Horse. Comments: A higher magnification of the three regions of the pituitary. Remains of Rathke’s pouch are
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Pituitary gland of the horse showing the three main parts
Organ: Pituitary, Species: Horse. Comments: The pars distalis, with numerous glandular cells, stains darker than the pars nervous which contains
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Pituitary gland of the horse. Coronal section at low power
Organ: Pituitary, Species: Horse. Comments: Low power micrograph of the pituitary showing, in a concentric fashion, the pars distalis, pars
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Adrenal gland of the horse adjacent to the vena cava
Organ: Adrenal, Species: Horse. Comments: The adrenal gland (right) in this species is attached to the vena cava (left). The
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Adrenal gland of the horse adjacent to the vena cava
Organ: Adrenal, Species: Horse. Comments: The adrenal gland (right) in this species is attached to the vena cava (left). Notice
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Islet of Langerhans in the pancreas of a primate.
Organ: Pancreas, Tissue: Islet, Species: Primate. Comments: Islet of Langerhans in the pancreas. The best way to demonstrate the various
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Medulla of Feline Thymus
The medulla of the thymus is paler in staining when compared to that of the cortex. There are plasma cells,
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Low Power Micrograph of Feline Thymus
The thymus is divided into lobes and then lobules. The cortex stains darker because the lymphocytes there are closely packed
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Red and White Pulp in Canine Spleen
This section was stained by the Gomori iron method in which the metal stained blue. The nuclear counter stain used
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Trabecular Artery in Canine Spleen
The trabecular artery has a distinctive tunica media made up of smooth muscle cells. It also has a tunica adventitia
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Trabecular Vein in Canine Spleen
The trabecular vein in the spleen has an tunica intima made up of a layer of endothelial cells. The rest
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Trabecular Artery and Vein in the Spleen of a Dog
The trabeculae in the spleen contain smooth muscle cells and connective tissue. The trabecular artery has its own muscular wall
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Trabecular Artery in Canine Spleen
This slide shows the longitudinal section of a trabecular artery in the spllen. Notice the smooth muscle cells that make
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Medulla of Lymphoid Nodule in Cloacal Bursa of Chicken
Several cells types are found in the medulla. The most obvious ones are the lymphocytes. The other cells inlude reticular
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Lymphoid Nodule in Bursa of Fabricius
The nodule has a darker staining cortex with densly packed small lymphocytes. The medulla contains cells of various sizes including
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Lymphoid Nodules and Surface Epithelium of Chicken Cloacal Bursa
The surface of the bursa fold is covered by a pseudostratified columnar epithelium. This micrograph shows three lymphoid nodules with
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Cloacal Bursa of Chicken
The cloacal bursa of Fabricius in birds is a lymphoid organ in the cloaca. Mucosal folds (pleicae) project into the
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Cortex of the canine thymus
System: Lymphoid, Organ: Thymus, Tissue: Cortex, Species: Dog. Comments: The cortex contains tightly packed small lymphocytes that make this area
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Medulla of the canine thymus with Hassall’s corpuscles
System: Lymphoid, Organ: Thymus, Tissue: Medulla, Species: Dog. Comments: The eosinophilic Hassall’s corpuscles are characteristic features of the thymus. The
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Cortex and medulla of the canine thymus
System: Lymphoid, Organ: Thymus, Species: Dog. Comments: One half of the micrograph shows the cortex with tightly packed small lymphocytes
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Thymus of the dog
The cortex stains darker than the medulla because the former is mostly made up of densely packed lymphocytes. The cortex
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Thymus of the dog at low power
A thin connective tissue forms the capsule of this organ. Connective tissue septae extending inward from the capsule divide the
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Peyer’s patch in the ileum of the dog, cut “en face”
System: Lymphoid, Organ: Ileum, Tissue: Peyer’s patch, Species: Dog. Comments: Peyer’s patch cut “en face”. As the cut slants deeper
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A lymphoid nodule in the Peyer’s patch
System: Lymphoid, Organ: Ileum, Tissue: Peyer’s patch, Species: Dog. Comments: Peyer’s patch cut “en face”. Crypts of Lieberkuhn surround a
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Peyer’s patch in the ileum cut “en face”
System: Lymphoid, Organ: Ileum, Tissue: Peyer’s patch, Species: Dog. Comments: Peyer’s patch cut “en face”. Crypts of Lieberkuhn surround the
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Peyer’s patch in the ileum
System: Lymphoid, Organ: Ileum, Tissue: Peyer’s patch, Species: Dog. Comments: Low magnification of the Peyer’s patch cut “en face”. The
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Canine thymus, medulla with Hassall’s corpuscles
Organ: Thymus, Tissue: Medulla, Species: Dog. Comments: In the medulla of the thymus the cells are further apart. Thus the
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Medulla of canine thymus with thymic corpuscles
Organ: Thymus, Tissue: Medulla, Species: Dog. Comments: In the medulla of the thymus the cells are further apart and the
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Cortex of Canine Thymus
In the cortex of the thymus illions of lymphocytes are produced here each day and these are, by definition, T
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