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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?

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closed as off-topic by anongoodnurse, AliceD, rg255, March Ho, Ilan Jul 24 '15 at 20:37

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Homework questions are off-topic on Biology unless you have shown your attempt at an answer. For more information see our homework policy." – anongoodnurse, AliceD, rg255, March Ho, Ilan
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ This is very trivial - it's a one word answer, no. I got my answer by go ogling "circle of willis dogs" hence closing as poorly researched. $\endgroup$ – rg255 Jul 24 '15 at 4:39
  • $\begingroup$ I agree that the question could have been rephrased in a better way. Also, 90% questions here can be googled. It's more about getting pointed in the right direction - to publications and established research. $\endgroup$ – Adit Gupta Jul 24 '15 at 4:42
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    $\begingroup$ See the help pages on writing good quality questions $\endgroup$ – rg255 Jul 24 '15 at 4:45
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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:

http://www.neuroanatomy.org/2008/054_065.pdf

http://www.ncbi.nlm.nih.gov/pubmed/14651482

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