What is the main artery in the brain?

carotid

Also asked, what causes narrowing of blood vessels in the brain?

Intracranial stenosis is a narrowing of an artery inside the brain. A buildup of plaque (atherosclerosis) inside the artery wall reduces blood flow to the brain. Atherosclerosis that is severe enough to cause symptoms carries a high risk of stroke and can lead to brain damage and death.

What is a blocked artery in the brain?

When an artery inside the skull becomes blocked by plaque or disease, it is called cerebral artery stenosis. Arteries anywhere in the body can become blocked. For example, carotid artery stenosis is a narrowing of the large artery in the neck, the carotid, that supplies oxygen-rich blood to the brain.

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