Hand. Coloured X-ray of the hand of a 5-year-old girl showing its skeletal structure (pink). There are areas of cartilage in the joints between the phalanges (finger bones), and between the phalanges and metacarpals (bones of the palm of the hand). The cartilage will gradually be replaced with bone by the process of ossification as the child develops and grows. The radius (bottom left) and ulna (bottom right) of the lower arm are seen.
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