Posterior ciliary veins

The posterior ciliary veins originate from the post-equatorial sectors of the choroidea. They leave the eyeball near the equator and follow its horizontal meridian. They may be complemented or replaced by veins exiting near the posterior pole of the bulb. In carnivores, these are simply satellite veins of the posterior ciliary arteries, while in the ungulates, the size and number of these veins are highly variable. They collect blood from the vascular layer of eyeball.