The function of the circle of Willis is to equalize blood pressure to the brain and provide an alternate blood source should one of the vessels involved be compromised.

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The circle of Willis is a circulatory anastomosis that supplies blood to the brain and surrounding structures. It is designed to equalize the blood pressure in the brain and provide an alternative route for blood flow if one of the arteries feeding the brain is blocked or narrowed (compromised), ensuring the brain remains adequately perfused.

The Function of the Circle of Willis Is to Equalize