Circle of Willis | Blood Circulation of Brain | Berry Aneurysm скачать в хорошем качестве

Circle of Willis | Blood Circulation of Brain | Berry Aneurysm

The circle of Willis (also called Willis' circle, a loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures. It is named after Thomas Willis, an English physician. The circle of Willis is a part of the cerebral circulation and is composed of the following arteries 1. Anterior cerebral artery (left and right) 2. Anterior communicating artery 3. Internal carotid artery (left and right) 4. Posterior cerebral artery (left and right) 5. Posterior communicating artery (left and right) The circle of Willis surrounds the optic tracts, pituitary stalk, and basal hypothalamus. It includes the three sets of paired cerebral arteries plus the anterior communicating artery, interconnecting the ACAs, and the posterior communicating arteries, interconnecting the MCAs and PCAs. The free flow of arterial blood through the communicating arteries usually is insufficient to perfuse the brain adequately in the face of occlusion to a major cerebral artery; the circle of Willis is fully patent and functional for free flow through the communicating arteries in only approximately 20% of individuals. The circle of Willis is the most common site of cerebral aneurysms. Join us now for Personalized Medical Education https://www.medcampus.io/ Download medCampus app Android: https://play.google.com/store/apps/de... iOS: https://apps.apple.com/us/app/medcamp... #neetpg #usmle #medcampus.io