When something gets compromised, the Circle of Willis was designed to compensate. :)

The circle of Willis (circulus arteriosus cerebri) is an anastomotic system of arteries that sits at the base of the brain. The “circle” was named after Thomas Willis by his student Richard Lower.

Neurology----Major arteries in the head and neck: basilar artery, circle of willis, external carotid arteries, vertebral arteries, common carotid arteries, subclavian arteries, and aorta

carotid arteries neurology major arteries in the head and neck: basilar artery

The Circle of Willis is an arterial polygon formed as the internal carotid and vertebral systems anastomose around the optic chiasm and infundibulum of the pituitary stalk in the suprasellar cistern. This communicating pathway allows equalization of blood-flow between the two sides of the brain, and permits anastomotic circulation, should a part of the circulation be occluded.    https://radiopaedia.org/articles/circle-of-willis

Commonly seen variants of the circle of willis. See article for more information.

Interesting way to remember the Circle of Willis  https://ellievsmedicalschool.wordpress.com/2015/01/04/in-which-ellie-gets-desperate-with-her-mnemonic-devices/

Interesting way to remember the Circle of Willis https://ellievsmedicalschool.wordpress.com/2015/01/04/in-which-ellie-gets-desperate-with-her-mnemonic-devices/

Circle of Willis Anatomy and Brain Aneurysms video - Animation and Narration by Cal Shipley, M.D. - YouTube

Circle of Willis Anatomy and Brain Aneurysms video - Animation and Narration by Cal Shipley, M.

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