Brain arteries

The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures. It is named after Thomas Willis (1621–1675), an English physician.Fetal ultrasound image at the level of circle of Willis, showing PCA, MCA and ACACerebral angiogram showing an anterior/posterior projection of the vertebrobasilar and posterior cerebral circulation, the posterior aspect of the circle of Willis, and one of its feeding vesselsAn anterior view of major cerebral and cerebellar arteries.Circle of WillisCircle of Willisocular group: central retinal The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures. It is named after Thomas Willis (1621–1675), an English physician. The circle of Willis is a part of the cerebral circulation and is composed of the following arteries: The middle cerebral arteries, supplying the brain, are not considered part of the circle.