Medical Sciences

Blood Supply Of Brain The brain is supplied by two systems namely 1. Carotid system(70%) 2. Vertebrobasilar system(30%) Carotid System: Carotid system consists of an internal carotid artery, a branch of the common carotid artery. Internal carotid artery originates from the common carotid artery at the level of C4. After originating from the common carotid artery ascends upward through the carotid canal of the temporal bone then passes anterior through the cavernous sinus and enters the subarachnoid space. At lateral sulcus, ICA divides into  Anterior cerebral artery. Middle cerebral artery. Following are the branches of ICA which supplies the brain  1.ANTERIOR CEREBRAL ARTERY It curves backwards over corpus callosum and does an anastomosis with posterior cerebral artery. Cortical branches Supply the medial surface of hemisphere while central branches supply lentiform caudate and internal capsule. 2.OPHTHALMIC ARTERY  Supplies orbital structures. 3.MIDDLE CEREBRAL ARTERY R...