LUNAGRAFIX / SCIENCE PHOTO LIBRARY LUNAGRAFIX / SCIENCE PHOTO LIBRARY
Child's arm. Coloured X-ray of the bones in the forearm of a child. The two bones of the forearm (upper to lower centre) are the radius, left and ulna, right. These form the elbow joint (narrow, orange, upper centre) with the end of the humerus bone (orange, top centre) of the upper arm. They then run down to the wrist (small purple ovals, lower centre). The phalanges, the bones that form the fingers in the hand, can be seen at bottom.
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