Dictionary of Human Evolution and Biology

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Long Bone

One of the four types of bones as classified by their shape: a bone longer than it is wide with a shaft (diaphysis) and two ends (epiphyses), composed principally of compact bone covered with periosteum, but with cancellous bone and red marrow inside the epiphyses. Many of the bones of the appendicular skeleton are long bones, such as the femur, humerus, and phalanges. Long bones undergo endochondral ossification.

Cf. flat bone, short bone, and irregular bone.

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