Saturday, August 27, 2011

Circle of Willis

The circle of Willis is circle of anastomosed major blood vessels that is located at the base of the cerebrum. The circle of Willis is formed by the right and left interior carotid arteries, anterior cerebral arteries, anterior communicating arteries, and posterior communicating arteries. If one of the main arteries that make up the circle of Willis is occluded, the distal smaller arteries that it supplies can receive blood from the other arteries as a collateral circulation. The circle of Willis supplies the brain with oxygenated blood.