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.