Circle Of Willis

Wednesday, December 4th 2013. | Anatomy

Circle of Willis

Circle of Willis (circulus arteriosus cerebri) is  a ring of arteries at the base of the brain, at the Circle of Willis, the internal carotid arteries branch into smaller arteries that supply oxygenated blood to over 80% of the cerebrum. 
The circle of Willis is formed when the internal carotid artery (ICA) enters the cranial cavity bilaterally and divides into the anterior cerebral artery (ACA) and middle cerebral artery (MCA). The anterior cerebral arteries are then united by an anterior communicating (ACOM) artery. 
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