![The Circle of Willis situated at the base of the brain is the central junction of the main arteries that supply blood to the human brain. It is the central junction between the two internal carotid arteries which supply much of the brain and the two vertebral arteries that supply the rest of the brain. [source]](http://30.media.tumblr.com/tumblr_l7cmmu7NpF1qa6reco1_400.jpg)
The Circle of Willis situated at the base of the brain is the central junction of the main arteries that supply blood to the human brain. It is the central junction between the two internal carotid arteries which supply much of the brain and the two vertebral arteries that supply the rest of the brain. [source]
