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What is "circle of willis"

Wiktionary
circle of willis

n. (context anatomy English) A circle of artery that supply blood to the brain and surrounding structures.

WordNet
circle of Willis

n. a ring of arteries at the base of the brain

Wikipedia
Circle of Willis

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.

Usage examples of "circle of willis".

It started at an existing weakness in part of the Circle of Willis, the brain's own blood-beltway.