Cerebrovascular Anatomy

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Blood Supply of Brain and Spinal Cord Lecture: 17

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Presentation transcript:

Cerebrovascular Anatomy M. Christopher Wallace M.D. The Toronto Western Hospital, University Health Network University of Toronto Postgraduate Lecture Series Division of Neurosurgery Friday October 6, 2000 2

Collateral Circulation Circle of Willis Variation Leptomeningeal Collateral

Cerebral Autoregulation Maintenance of blood flow during variation in blood pressure Change in blood flow related to metabolic activity

Mechanism for Cerebral Autoregulation? Myogenic Neurogenic Metabolic

Measurement of Cerebral Blood Flow Seymour Kety Delivery of blood flow to given wt of brain per time period 50ml/100grams/minute Brain takes 12-15% of cardiac output

Internal Carotid Artery Divisions: cervical, petrous, cavernous, infraclinoid, supraclinoid Branches: meningohypophyseal trunk dorsal meningeal artery, tentorial artery, inferior hypophyseal artery of the inferior cavernous sinus capsular arteries of McConnell

Internal Carotid Artery

Internal Carotid Artery Supraclinoid Branches Ophthalmic Posterior communicating Anterior choroidal Bifurcation

Middle Cerebral Artery Variation Divisions (M1-M4) Lenticulostriate arteries medial lateral putamen, caudate, sup internal capsule

Anterior Cerebral Artery Variation Divisions (A1-A4) Anterior communicating artery Lamina terminalis, septal region, fornix, preoptic/hypothalamus Recurrent artery of Heubner Anterior putamen, pallidum and internal capsule