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.

The vertebral arteries are not normally considered part of the circle of Willis, but are important to the intracranial arterial supply. view more Credit: Penn Medicine/Brett Cucchiara, MD and John ...

The vertebral arteries are not normally considered part of the circle of Willis, but are important to the intracranial arterial supply. Credit Penn Medicine/Brett Cucchiara, MD and John Detre, MD ...

The brain and the 'Circle of Willis' are examined at autopsy. Thickening of arteries due to atherosclerosis, bursting of aneurysm and haemorrhage of brain are seen at autopsy.