Circle of willis: The circle of Willis (circulus

The circle of Willis (circulus arteriosus cerebri) is a vascular network at the brain's base that connects major arterial supplies, the internal carotid and vertebrobasilar systems. Forming a protective collateral pathway, it reduces ischemic risk by rerouting blood flow during blockages. The structure typically includes the anterior, middle, and posterior cerebral arteries (PCAs) linked by the anterior and posterior communicating (PCOM) arteries. [1] The circle of Willis encircles the stalk ... The circle of Willis is a circulatory anastomosis that supplies blood to the brain and surrounding structures in humans and other vertebrates. It is named after Thomas Willis , an English physician, and has various anatomic and clinical significance. The circle of Willis is a circle of arteries that act as a backup system should an artery in the brain become blocked or narrowed . If this occurs, blood can be rerouted so that damage to brain tissues is avoided or reduced. The Circle of Willis is a ring-like arterial structure located at the base of the brain which supplies blood to the brain and surrounding structures. It is a component of the cerebral circulation and comprise of five arteries.