The circle of Willis is a junction of several important arteries at the bottom part of the brain. Learn more about its anatomy, function, and more.

[2] Sex-specific anatomical variation of circle of Willis arteries. NeuroImage (2025). [3] Association between circle of Willis and ischaemic stroke: a systematic review and meta-analysis .

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 carotid and the posterior cerebral arteries.

The vertebral arteries are not normally considered part of the circle of Willis, but are important to the intracranial arterial supply. Credit Penn Medicine/Brett Cucchiara, MD and John Detre, MD ...

The vertebral arteries are not normally considered part of the circle of Willis, but are important to the intracranial arterial supply. Credit: Penn Medicine/Brett Cucchiara, MD and John Detre, MD ...

Migraine with Aura Is Associated with an Incomplete Circle of Willis: Results of a Prospective Observational Study. PLoS ONE , 2013; 8 (7): e71007 DOI: 10.1371/journal.pone.0071007 Cite This Page : ...

The arterial supply of blood to the brain is protected by a series of connections between the major arteries, termed the "circle of Willis" after the English physician who first described it in ...

The vertebral arteries are not normally considered part of the circle of Willis, but are important to the intracranial arterial supply. view more Credit: Penn Medicine/Brett Cucchiara, MD and John ...

PICA = posterior inferior cerebellar artery, SCA = superior cerebellar artery, PCA = posterior cerebral artery. ... Aneurysms usually occur at arterial bifurcations and mostly arise from the anterior ...

Aneurysms are usually located in the intracranial arteries which lack an external elastic lamina and have a very thin adventitia ... Aneurysms usually occur at arterial bifurcations and mostly arise ...

The brain and the 'Circle of Willis' are examined at autopsy. Thickening of arteries due to atherosclerosis, bursting of aneurysm and haemorrhage of brain are seen at autopsy.