Circle of willis: The Circle of Willis is a circular

The Circle of Willis is a circular network of arteries located at the base of the brain, in the region surrounding the optic chiasm and pituitary gland. It connects the anterior and posterior circulations of the brain, providing a crucial anastomotic system. Learn about the circle of Willis , a ring-shaped structure of arteries at the base of your brain that connects two major blood flow pathways. Find out how it can affect your risk of stroke, aneurysm, moyamoya disease and other brain issues. The circle of Willis is a junction of several important arteries at the bottom part of the brain. Learn more about its anatomy, function, and more. An overview of the arterial blood supply to the brain, including the anterior and posterior cerebral circulation, in addition to the Circle of Willis .