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The Circle of Willis sits in the subarachnoid space around the base of the brain, encircling the optic chiasm and the pituitary stalk. It’s formed by a network of arteries that link the anterior and posterior circulations. The internal carotid arteries enter the brain and give rise to the anterior cerebral arteries, which are connected across the midline by the anterior communicating artery. The internal carotids also give off the middle cerebral arteries, which do not contribute directly to the