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The image depicts the structure of a long bone. Compact bone, similar in basic structure to spongy bone, features regularly arranged, tightly packed bone lamellae, providing protection and bearing weight. Long bones consist of a shaft (diaphysis) and two ends (epiphyses), with the shaft containing a marrow-filled cavity. The shaft is predominantly compact bone, while the epiphyses are mainly spongy bone covered by a thin layer of compact bone. The bone is structured into osteons (Haversian systems) consisting of Haversian canals surrounded by concentric lamellae. These are separated by interstitial lamellae. The bone surface has inner and outer circumferential lamellae.
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