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Lecture 12

SPHR 2106 Lecture Notes - Lecture 12: Endarterectomy, Antibody, Thrombosis

Speech and Hearing Science
Course Code
SPHR 2106

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Cerebrovascular System
(blood supply to the brain)
Brain’s metabolic need: blood supplies 20% oxygen and glucose to brain
Circulatory Interruption Implications: Infarct (interruption)
CVA:cerebrovascular accident, will cause immediate damage and damage beyond
immediate area (penumbra)
Ischemic penumbra: stop blood flow
Damage cost affect nerve cells around artery and stops blood flow to penumbra
Only takes 20 minutes surrounding the area to die
Collateral supply will survive up to 6-8 hours
Arteries: supply oxygenated blood
Veins: return deoxygenated blood
Thinner than arteries
Lower average blood pressure
Two Main Sources of Blood to the Brain:
Carotid : come off of aortic arch
Vertebral: come off of subclavian artery
Meet to form basilar artery
Basal artery and internal carotid artery form the circle of willis
Circle of willis is completed by joining branch basilar arteries
Circle of Willis: vertebral artery form basilar artery
Basilar artery branches in posterolateral branches
Circle of willis: posterior and anterior communicating artery, provides protection and
contralateral circulation in case of damage to one side
LAteral surface: middle cerebral artery
Anterior cerebral artery: superior and medial surface
Posterior cerebral artery: occipital lobe
LEft CVA(cerebrovascular accident): to middle cerebral artery
Anterior Cerebral artery:
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