I understand that Circle of Willis is a circulatory anastomotic system that provided blood to the brain. I want to understand if this system is unique to humans or does it exist in other species or mammals to be more specific?
closed as off-topic by anongoodnurse, AliceD♦, rg255, March Ho, Ilan Jul 24 '15 at 20:37
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I found two references that talk about the circle of Willis in different kind of mammals so i think it's right to say that this particular anastomotic system of arteries is not exclusive to humans.
Here are the two references: