medullary cavity
inside diaphysis
The medullary cavity or marrow cavity is a central hollow space found in the long bones of the body, including the femur, humerus, tibia, and fibula. It is lined with a thin layer of connective tissue called the endosteum and contains bone marrow, which is responsible for generating new blood cells.
The medullary cavity is formed during the development of bones, as layers of bone tissue surround and enclose a central space. In adults, the medullary cavity contains either red or yellow marrow.
Red bone marrow, also known as myeloid tissue, is responsible for producing red blood cells, white blood cells, and platelets. It is found in the medullary cavity of the larger bones in adults, such as the sternum, pelvis, ribs, and skull. Yellow bone marrow, on the other hand, primarily contains adipose cells and is found in the medullary cavity of long bones in adults.
The medullary cavity also plays a crucial role in bone growth and maintenance. When bones are subjected to mechanical stress, such as through exercise, the cells lining the medullary cavity respond by producing new bone tissue. In conditions like osteoporosis, where bone loss occurs, the medullary cavity can expand, leading to a weakening of the bone and increasing the risk of fractures.
More Answers:
Endosteum: The vital connective tissue lining the inner surface of bonesThe Vital Role of Periosteum in Bone Health: Structure, Function, and Importance for Prevention of Bone Disease and Fractures.
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