Learn about the circle of Willis , an anastomotic ring of arteries that connects the internal carotid and vertebrobasilar systems to the brain. Find out its structure, function, sources and clinical relevance with diagrams, quizzes and videos. The Circle of Willis is an arterial network located at the base of the brain, formed by the interconnection of the anterior, middle, and posterior cerebral arteries, along with the anterior and posterior communicating arteries. It connects the internal carotid arteries to the vertebral arteries, allowing the distribution of cerebral blood flow. The circle of Willis (CoW) is an anatomical structure that provides an anastomotic connection between the anterior and posterior circulations , providing collateral flow to affected brain regions in the event of arterial incompetency. Learn about the circle of Willis , an anastomotic arterial ring at the base of the brain that connects the four main arteries that supply the brain. Find out its structure, location, and the vessels that arise from it.
