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Vertebrobasilar system

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This 3D, surface-rendered, CT angiography of the vertebrobasilar system shows the segments of the vertebral artery as well as the origin of the left vertebral artery from the left subclavian artery. (Contributed by Dr. Douglas Lanska. Source: Gaillaird F. Courtesy of Wikimedia Commons. Creative Commons Attribution-Share Alike 3.0 Unported.)