First up, note that the most important & unique part of this dissection is the depiction of the Median Artery of Corpus callosum (MACC) which is only present in 13% of the individuals! Circle of willis: The circle of Willis (Circulus arteriosus cerebri) is an anastomotic system of arteries that sits at the base of the brain. The "circle" was named after Thomas Willis by his student Richard Lower. The circle of Willis encircles the stalk of the pituitary gland and provides important communications between the blood supply of the forebrain and hindbrain (ie, between the internal carotid and vertebrobasilar systems following obliteration of primitive embryonic connections). Formation of the COW: The circle of Willis is formed when the internal carotid artery (ICA) enters the cranial cavity bilaterally and divides into the anterior cerebral artery (ACA) and middle cerebral artery (MCA). The anterior cerebral arteries are then united by an anterior communicating (ACOM) artery. These connections form the anterior half (anterior circulation) of the circle of Willis. Posteriorly, the basilar artery, formed by the left and right vertebral arteries, branches into a left and right posterior cerebral artery (PCA), forming the posterior circulation. The PCAs complete the circle of Willis by joining the internal carotid system anteriorly via the posterior communicating (PCOM) arteries. Medicogram - in collaboration with Dr. @juanj.altafulla , who helped us and made us able to publish this article for all of you! Thank As a matter of fact circle of willis is never been explained and depicted like this before!