★ Must-know
The brain is supplied by two internal carotid arteries and two vertebral arteries, whose branches anastomose on the inferior surface of the brain to form the circle of Willis.
The circle of Willis includes:
📌 The circle of Willis allows blood entering through either the internal carotid or vertebral arteries to reach either cerebral hemisphere, while cortical and central branches supply the brain substance.
Further detail
1. Which artery is the largest branch of the vertebral artery and supplies the inferior cerebellum, medulla oblongata, and choroid plexus of the fourth ventricle?
2. What is the circle of Willis?
3. What vascular function does the circle of Willis provide?
Which arteries supply the brain and form the circle of Willis?
Two internal carotid and two vertebral arteries supply the brain and form the circle of Willis.
What is the circle of Willis?
An arterial anastomotic ring at the brain's base in the interpeduncular fossa.
Which arteries are included in the circle of Willis?
Anterior communicating, anterior cerebral, internal carotid, posterior communicating, posterior cerebral, and basilar arteries.
What does the circle of Willis allow regarding blood flow?
It allows blood from internal carotid or vertebral arteries to reach either cerebral hemisphere.
What do cortical and central branches of the circle of Willis supply?
They supply the brain substance.
Are variations in the arteries of the circle of Willis common?
Yes, variations in artery sizes are common.
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