Vena cava of the horse
![](https://sites.tufts.edu/vetimages/files/2021/08/Vena_cava_of_the_horse-20430.jpg)
Organ: Vena cava, Species: Horse. Comments: Cross section of the vena cava. Notice that the smooth muscle cells are arranged in longitudinal bundles in the tunica adventitia. This is a characteristic of large veins.
Organ: Vena cava, Species: Horse. Comments: Cross section of the vena cava. Notice that the smooth muscle cells are arranged in longitudinal bundles in the tunica adventitia. This is a characteristic of large veins.