Reviewed: one independent reader; copy check clear.
circle of Willis
circle of Willis The circle of Willis is a ring-like network of connected arteries at the base of the brain.
The circle of Willis is a ring-like network of connected arteries at the base of the brain. It is formed by links among the internal carotid arteries and parts of the anterior, middle, and posterior cerebral arteries through the anterior and posterior communicating arteries.