What percentage of brain blood supply is provided by the external carotid artery?

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Multiple Choice

What percentage of brain blood supply is provided by the external carotid artery?

Explanation:
The brain’s main blood supply comes from two intracranial systems—the internal carotid and the vertebrobasilar circulation. The external carotid artery normally supplies extracranial structures (scalp, face, and dura via dural branches). However, there are collateral connections from external carotid branches to intracranial vessels through meningeal and leptomeningeal anastomoses. This collateral pathway can contribute a meaningful portion of cerebral blood flow, often cited as about 30% in practical teaching. So, while the external carotid isn’t a primary brain feeder, its potential collateral contribution is around 30%, which is why that option is considered correct.

The brain’s main blood supply comes from two intracranial systems—the internal carotid and the vertebrobasilar circulation. The external carotid artery normally supplies extracranial structures (scalp, face, and dura via dural branches). However, there are collateral connections from external carotid branches to intracranial vessels through meningeal and leptomeningeal anastomoses. This collateral pathway can contribute a meaningful portion of cerebral blood flow, often cited as about 30% in practical teaching. So, while the external carotid isn’t a primary brain feeder, its potential collateral contribution is around 30%, which is why that option is considered correct.

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