BSIP, S & I / SCIENCE PHOTO LIBRARY BSIP, S & I / SCIENCE PHOTO LIBRARY
Head arteries. Coloured angiogram (X-ray) of arteries in the head and neck. One of the two carotid arteries is seen leading up from lower left. It is seen branching off the subclavian artery (arched, bottom left) before branching extensively in the head (upper right). The carotid arteries supply the brain with oxygen. The brain uses around a fifth of the oxygen taken up by the body. Angiography uses X-rays to visualise blood vessels. They are injected with a contrast medium opaque to X-rays to make them show up on the print.
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