Questions and Answers
Which arteries are part of the anterior cerebral circulation?
Internal carotid arteries
Which arteries are part of the posterior cerebral circulation?
Basilar artery
What is the average perfusion of blood per 100 grams of brain tissue per minute?
50 to 54 millilitres
Which arteries supply the anterior brain?
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What is the typical rate of cerebral blood flow in an adult human?
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What do veins carry back to the heart in cerebral circulation?
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Which of the following is true about cerebral perfusion pressure (CPP)?
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What happens to cerebral blood vessels when systemic blood pressure is raised?
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What is the effect of higher levels of carbon dioxide in the blood on cerebral blood vessels?
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What is the relationship between arterial partial pressure of carbon dioxide (PaCO2) and cerebral blood flow (CBF)?
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Study Notes
Cerebral Circulation
- Anterior cerebral circulation involves the anterior cerebral artery and the anterior communicating artery.
- Posterior cerebral circulation involves the posterior cerebral artery and the posterior communicating artery.
Blood Supply and Flow
- Anterior brain is supplied by the anterior cerebral artery and the middle cerebral artery.
- Typical rate of cerebral blood flow in an adult human is approximately 750 mL/min.
Cerebral Blood Flow Regulation
- Cerebral perfusion pressure (CPP) is the difference between mean arterial pressure and intracranial pressure.
- When systemic blood pressure is raised, cerebral blood vessels constrict (vasoconstriction) to maintain constant blood flow.
- Higher levels of carbon dioxide in the blood cause cerebral blood vessels to dilate (vasodilation), increasing blood flow.
Cerebral Perfusion and Veins
- Veins carry deoxygenated blood back to the heart in cerebral circulation.
- Average perfusion of blood per 100 grams of brain tissue per minute is approximately 50-60 mL.
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