ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Brain and arteries. Coloured three-dimensional MRA (magnetic resonance angiography) scan of healthy arteries (yellow/red) supplying a human brain with oxygenated blood. The brain is seen from the front with the brainstem (lower centre) protruding from the rear base of the brain. MRA is a magnetic resonance imaging (MRI) technique that highlights blood vessels. For an MRA scan of the brain of a patient who has had a stroke, see image M136/134.
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