The tela choroidea of the prosencephalon in sheep is vascularized by an anterior choroidal artery arising from the rostral branch of the carotid cerebral artery and by a posterior choroidal artery, arising from the caudal cerebral artery, branch of the carotidobasilar system. These two choroidal arteries give off choroidal branches which nourish the capillary networks of the tela. The latter consist of a velar capillary network and of a choroidal capillary network. Together, they drain into choroidal veinules and veins which are tributary of the superficial and of the deep venous systems of the brain.