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 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 usually occur at arterial bifurcations and mostly arise from the anterior circulation of the Circle of Willis (85%). The most common sites of aneurysms include: • Internal carotid ...

Transcranial Doppler (TCD) uses sound waves typically around the range of 2–5 MHz through the skull to find intracranial flow of the main circle of Willis arteries such as the first segments of ...