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Previous Volume 352:121-124 January 13, 2005 Number 2 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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The brain derives its blood supply from two internal carotid arteries, which supply most of the cerebrum, and two vertebral arteries, which merge to form the basilar artery and supply the brain stem, the cerebellum, and the visual cortex of the cerebrum. These vessels shed most of their external supporting layers as they enter the skull and are therefore considerably thinner and more fragile than vessels elsewhere in the body. On penetrating the dura mater, each vessel traverses the subarachnoid space at the base of the skull, where communications are established between the major trunks to form the circle of . . . [Full Text of this Article]

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Dr. Ellegala is a cerebrovascular fellow and Dr. Day the director of the Cerebrovascular Center and a professor of surgery in the Department of Neurosurgery, Brigham and Women's Hospital and Harvard Medical School, Boston.

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