ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Brain and neck arteries. Coloured frontal 3D computed tomography (CT) angiogram, combined with a 3D human model, showing the brain and neck arteries of a 40-year-old man. The neck arteries (carotid and vertebral) are shown meeting at the circle of Willis and branching out into the brain.
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