MIRIAM MASLO / SCIENCE PHOTO LIBRARY MIRIAM MASLO / SCIENCE PHOTO LIBRARY
Pelvic arteries, coloured angiogram X-ray. At the top of the scan is the descending aorta, the body's main artery. This divides (bifurcates) into the two common iliac arteries, which travel to the hips before each divides again, forming the internal and external iliac arteries. The latter becomes the femoral artery, the main artery of the leg. Arteries carry oxygenated blood from the heart to body tissues. Angiography is a technique for visualising arteries, in which a radio-opaque contrast medium is injected into the artery to be studied.
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