Circle of Willis & left vertebral artery?

Question: Does the Circle of Willis protect the brain from blockage to the left vertebral artery?

Answers:
The following sounds like the answer you seek...???

Function
The Circle of Willis provides multiple paths for oxygenated blood to supply the brain if any of the principal suppliers of oxygenated blood (i.e., the vertebral and internal carotid arteries) are constricted by physical pressure, occluded by disease, or interrupted by injury. This redundancy of blood supply is generally termed collateral circulation.

Found here: http://science.nhmccd.edu/biol/cardio/willis.htm

Search criteria used: "circle of Willis" +function

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