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endosteum
In anatomy the endosteum (plural endostea) is a thin vascular membrane of connective tissue that lines the surface of the bony tissue that forms the medullary cavity of long bones.〔Netter, Frank H. (1987). ''Musculoskeletal system: anatomy, physiology, and metabolic disorders''. Summit, New Jersey: Ciba-Geigy Corporation ISBN 0-914168-88-6, p.171〕
This endosteal surface is usually resorbed during long periods of malnutrition, resulting in less cortical thickness.
The outer surface of a bone is lined by a thin layer of connective tissue that is very similar in morphology and function to endosteum. It is called the periosteum, or the periosteal surface. During bone growth, the width of the bone increases as osteoblasts lay new bone tissue at the periosteum. To prevent the bone from becoming unnecessarily thick, osteoclasts resorb the bone from the endosteal side.
==Additional images==
File:Illu long bone.jpg |Long bone
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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