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5 Cards in this Set

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What is the Circle of Willis?
An anastomotic ring, from which all major cerebral vessels arise. Allows much collateral flow, but only a complete ring in ca. 25% of people.
What are the main arteries supplying blood to the Circle of Willis?
INTERNAL CAROTID ARTERIES (paired); VERTEBRAL ARTERIES (paired)which fuse into the BASILAR ARTERY
Which arteries provide most of the blood supply for the diencephalon and the cerebral hemispheres?
The INTERNAL CAROTID ARTERIES
Name the 3 main artery suppplies for the cortex and subscortical structures, with the artery from which each arises.
1.Anterior cerebral artery (from internal carotid arteries).
2. Middle cerebral artery (from internal carotid artery).
3. Posterior cerebral artery (from top of basilar artery).
Name 2 anastomes in the Circle of Willis.
1.Anterior communicating artery (anastomes of the anterior cerebral artery).
2. Posterior communicating artery (connect internal carotids to the posterior cerebral arteries).