ARTERIAL AND VENOUS VASCULARIZATION OF TH E CORPUS-CALLOSUM

Blood suply of the corpus callosum is assured by two arterial systems, the carotid system mainly and the vertebrobasilar system accessorily. The carotid system intervenes via the pericallosal artery, portion of the anterior cerebral artery distal to the anterior communicating art ery. This pericallosal artery can be bihemispheric in 4 to 12 % of the cases or azygos in 0.26 % of cases. In 20 to 80 % of cases, the media n callosal artery arises from the communicating artery. The vertebroba silar system intervenes in splenium vascularization by its terminal br anches. These two carotid and vertebrobasilar systems give rise to per forating arteries that assure intrinsic vascularization of the corpus callosum creating a system of regular vascular stiches around the fibe rs of the corpus callosum. The venous drainage of the corpus callosum is essentially via callosal veins and callosocingulate veins towards t he deep venous system of the brain.