The human choroïd tela of the third ventricle is essentially vascularized by the medial posterior choroïdal arteries, which are collatered branches of the posterior cerebral arteries. In some cases, the tela is also supplied by superior posterior choroïdal arteries which are branches of the pericallosal artery. These different arteries give off short and long choroïdal branches which supply the velate and choroïd capillary networks. The latter drain into the two internal cerebral veins by short and long choroïdal veins.