Which of the following arteries are part of the circle of Willis?
A. Internal carotid and vertebral arteries
B. Anterior and lateral cerebral arteries
C. Anterior and posterior cerebral arteries
D. Medial and lateral communicating arteries
ANS: C
Rationale: The circle of Willis is a ring of nine anastomotic arteries: the left and right anterior cerebral arteries, the left and right internal carotid arteries, the left and right posterior cerebral arteries, posterior communicating arteries (left and right), and the anterior communicating artery. The basilar artery and middle cerebral arteries are sometimes also included in the circle.
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