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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.

MeSH Unique ID: D002941

Entry Terms:

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

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