Which set lists the primary vessels involved in the Circle of Willis?

Which set lists the primary vessels involved in the Circle of Willis?

• A. An anterior cerebral, anterior communicating, internal carotid, posterior cerebral, posterior communicating, and basilar arteries
• B. An anterior cerebral, anterior communicating, internal carotid, posterior cerebral, posterior communicating, and basilar arteries
• C. The posterior spinal arteries and anterior spinal arteries
• D. The cerebral veins including the superior sagittal sinus

Answer: (B)

The Circle of Willis is an arterial ring at the base of the brain that links the anterior and posterior blood supplies to allow collateral flow if one pathway is blocked. The vessels that form this circle include the internal carotid arteries, the anterior cerebral arteries, the anterior communicating artery, the posterior cerebral arteries, the posterior communicating arteries, and the basilar artery. This combination creates the classic arterial loop that provides redundancy for cerebral circulation. Spinal arteries or venous structures like the cerebral veins and superior sagittal sinus are not part of this arterial circle; they serve different roles in circulation and drainage, not the arterial connections around the brainstem.

The Circle of Willis is an arterial ring at the base of the brain that links the anterior and posterior blood supplies to allow collateral flow if one pathway is blocked. The vessels that form this circle include the internal carotid arteries, the anterior cerebral arteries, the anterior communicating artery, the posterior cerebral arteries, the posterior communicating arteries, and the basilar artery. This combination creates the classic arterial loop that provides redundancy for cerebral circulation.

Spinal arteries or venous structures like the cerebral veins and superior sagittal sinus are not part of this arterial circle; they serve different roles in circulation and drainage, not the arterial connections around the brainstem.