Adrenal gland of the horse adjacent to the vena cava
![](https://sites.tufts.edu/vetimages/files/2021/07/Adrenal_gland_of_the_horse_adjacent_to_the_vena_cava-20389.jpg)
Organ: Adrenal, Species: Horse. Comments: The adrenal gland (right) in this species is attached to the vena cava (left). Notice the difference in staining between the cortex (darker) and the medulla (lighter).