SCOTT CAMAZINE, SUE TRAINOR / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE, SUE TRAINOR / SCIENCE PHOTO LIBRARY
Hand development. Coloured X-rays of (from left to right) the hands of a 2-year-old child, a seven- year-old child and an adult. The development of the bones (blue and black) is shown. As a child grows, the cartilage-filled spaces between the bones in the fingers (phalanges) and the bones in the palm (metacarpals) are replaced with bone. In adults the wrist joint (red) is composed of eight bones, but in young children several are still formed from cartilage (not seen).
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