What is the Circle of Willis?

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Multiple Choice

What is the Circle of Willis?

The Circle of Willis is an arterial ring at the base of the brain that connects the major vessels feeding the brain, specifically linking the internal carotid arteries with the vertebrobasilar system. It is formed by the anterior cerebral arteries joined by the anterior communicating artery, the posterior communicating arteries, and the posterior cerebral arteries arising from the basilar artery. This circular arrangement allows blood to be redistributed if one pathway is narrowed or blocked, providing collateral circulation to maintain cerebral perfusion. It’s an arterial structure, not a vein network, nerve plexus, or lymphatic ring.

The Circle of Willis is an arterial ring at the base of the brain that connects the major vessels feeding the brain, specifically linking the internal carotid arteries with the vertebrobasilar system. It is formed by the anterior cerebral arteries joined by the anterior communicating artery, the posterior communicating arteries, and the posterior cerebral arteries arising from the basilar artery. This circular arrangement allows blood to be redistributed if one pathway is narrowed or blocked, providing collateral circulation to maintain cerebral perfusion. It’s an arterial structure, not a vein network, nerve plexus, or lymphatic ring.

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