A study in PLOS ONE notes that about 70% of people may have an incomplete circle of Willis.Īn incomplete circle of Willis can take a few different forms. It is more common to see one of a few variations in the structure of the circle of Willis. The classic, complete anatomy of a circle of Willis is, in fact, only apparent in a minority of cases. Structural differences in the circle of Willis are common. The internal carotid arteries branch off from here into smaller arteries, which deliver much of the brain’s blood supply. The circle of Willis is critical, as it is the meeting point of many important arteries supplying blood to the brain. left and right posterior communicating arteries.left and right posterior cerebral arteries.left and right anterior cerebral arteries.
left and right internal carotid arteries.The structure of the circle of Willis includes: This structure allows all of the blood from the two internal carotid arteries to pass through the circle of Willis. The internal carotid artery then branches into the cerebral arteries. They run along either side of the neck and lead directly to the circle of Willis.Įach carotid artery branches into an internal and external carotid artery. Two arteries, called the carotid arteries, supply blood to the brain. The structure encircles the middle area of the brain, including the stalk of the pituitary gland and other important structures. The circle of Willis is an important junction of arteries at the base of the brain.
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