Watch this animation (http://openstaxcollege.org/l/bloodflow1) to see how blood flows to the brain and passesthrough the circle ofWillis before being distributed through the cerebrum. The circle of Willis is a specializedarrangement of arteries that ensure constant perfusion ofthe cerebrum even in the event of a blockage of one ofthe arteries in the circle. The animation shows the normaldirection of flow through the circle of Willis to the middlecerebral artery. Where would the blood come from if therewere a blockage just posterior to the middle cerebral arteryon the left?

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