1. 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

2. Collateral Circulation
Circle of Willis
Variation
Leptomeningeal Collateral

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

4. Mechanism for Cerebral Autoregulation?
Myogenic
Neurogenic
Metabolic

5. 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

6. 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

7. Internal Carotid Artery

9. Internal Carotid Artery
Supraclinoid
Branches
Ophthalmic
Posterior communicating
Anterior choroidal
Bifurcation

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

14. 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