For instance, a change in the anterior communicating artery may keep the circle of Willis from being complete. A few different changes are possible here, including fenestration and duplication.

Medically reviewed by Nicholas R. Metrus, MD The posterior communicating artery (PCOM) is a part of a group of arteries in the brain known as the circle of Willis. The artery connects the internal ...

The arrowhead indicates absent anterior communicating artery and arrows indicate ... The vertebral arteries are not normally considered part of the circle of Willis, but are important to the ...

Aneurysms usually occur at arterial bifurcations and mostly arise from the anterior circulation of the Circle of Willis (85%). The most ... • Anterior communicating artery • Middle cerebral artery ...

The arrowhead indicates absent anterior communicating artery and arrows indicate bilateral absent posterior ... The vertebral arteries are not normally considered part of the circle of Willis, ...

The anterior cerebral artery supplies blood to parts of the frontal and parietal lobes of the brain. Also known as the ACA, it is one of a pair of arteries essential to delivering oxygen to the brain.

Aneurysms usually occur at arterial bifurcations and mostly arise from the anterior circulation of the Circle of Willis (85%). The most ... • Anterior communicating artery • Middle cerebral artery ...

The image depicts the anatomy of the circle of Willis (A) ... The arrowhead indicates absent anterior communicating artery and arrows indicate bilateral absent posterior communicating arteries.