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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. Collateral Circulation. Circle of Willis Variation Leptomeningeal Collateral.

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cerebrovascular anatomy

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

collateral circulation
Collateral Circulation
  • Circle of Willis
  • Variation
  • Leptomeningeal Collateral
cerebral autoregulation
Cerebral Autoregulation
  • Maintenance of blood flow during variation in blood pressure
  • Change in blood flow related to metabolic activity
mechanism for cerebral autoregulation
Mechanism for Cerebral Autoregulation?
  • Myogenic
  • Neurogenic
  • Metabolic
measurement of cerebral blood flow
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
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 artery9
Internal Carotid Artery
  • Supraclinoid
  • Branches
    • Ophthalmic
    • Posterior communicating
    • Anterior choroidal

Bifurcation

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