Circle of Willis

A polygonal anastomosis at the base of the brain formed by the internal carotid (CAROTID ARTERY, INTERNAL), proximal parts of the anterior, middle, and posterior cerebral arteries (ANTERIOR CEREBRAL ARTERY; MIDDLE CEREBRAL ARTERY; POSTERIOR CEREBRAL ARTERY), the anterior communicating artery and the posterior communicating arteries.

Year introduced: 1965

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Tree Number(s): A07.015.114.228.351

MeSH Unique ID: D002941

Entry Terms:

• Willis' Circle
• Circle, Willis'
• Willis Circle
• Cerebral Arterial Circle
• Arterial Circle, Cerebral

All MeSH Categories
Anatomy Category
Cardiovascular System
Blood Vessels
Arteries
Cerebral Arteries
Circle of Willis