J. C. REVY, ISM / SCIENCE PHOTO LIBRARY J. C. REVY, ISM / SCIENCE PHOTO LIBRARY
Bent elbow. Coloured X-ray of the bones (red) of a bent elbow joint seen from the side. The upper arm bone (humerus) runs down from top to join with the 2 lower arm bones (ulna, bottom, and radius, top).
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