Cerebrovascular Anatomy 1 by MedMaterials

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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
    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

								
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