Cortex and medulla of the canine thymus
![](https://sites.tufts.edu/vetimages/files/2021/07/Cortex_of_the_canine_thymus-20417.jpg)
System: Lymphoid, Organ: Thymus, Species: Dog. Comments: One half of the micrograph shows the cortex with tightly packed small lymphocytes that make this area stain darker. The medulla is less compact and contains eosinophilic Hassall’s corpuscles.