Carotid arteries. Coloured angiogram (X-ray) of a neck showing its healthy carotid arteries (down centre). These blood vessels supply the head with blood. The common carotid (bottom centre) splits into the external carotid (left) and internal carotid (right) at lower centre. The neck (cervical) vertebrae of the spine run down the right side of the image. The arteries have been injected with a contrast medium to enable them to be seen in this X-ray image.
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