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This is mainly observed in children as a fast-paced process, which slows down considerably once adulthood is attained. Function – internal lining of the bony trabeculae. The endosteum has a characteristic structure, being comprised of a single layer of endosteal cells, with the connective tissue being quite loosely organized. This process can take several months for the bone to heal completely. The damaged blood vessels deprive the cells of bones vital nutrients for growth and as result they die. Your email address will not be published. Osteoblasts multiply and converts fibrocartilaginous callus into a bony callus. The endosteum lines the interior walls of the haversian canals that constitute compact bones, plus it covers the small trabeculae. They also elevate your vulnerability to fractures with or without any form of trauma. It works in conjunction with the periosteum, maintaining the health of the bone, especially after fractures or bone marrow harvesting. Endosteum is composed of endosteal cells or ‘bone lining’ cells as they are also called. Endosteum has cells known as endosteal. The periosteum has a more complex structure, containing two layers of periosteal cells. Also known as the medullary membrane, the endosteum practically represents the interior lining of the walls of different cavities that the bone marrow is organized of. The endosteum is located on the internal surface of the bone, being the membranous layer that covers the medullary cavity, the bony trabeculae (spongy part of the bone), the haversian canals and internal walls of the compact long bones. This is a medical condition where bones are not dense and become more fragile. Hyperparathyroidism- This is a condition where parathyroid gland secretes excess parathyroid hormone in the body. These cells are active participants in bone growth, repair, and remodeling. The endosteum can be seen in the T.S. Our bones continue to be renewed after birth and into adulthood. Endosteum also has few connective tissues fibers and blood vessels. The periosteum, working in harmony with the endosteum, contributes to the growth of the bone, playing its part in the remodeling and repair processes as well. Endosteum can allow bone to grow in width and thickness. The interesting thing is that the endosteum is resorbed when one suffers from severe or prolonged malnutrition, thus leading to a reduced cortical thickness. Endosteum is located in the medullary canal, spongy tissue of bone, Volkmann’s canal, and the Haversian canal while the periosteum is situated on the outer bone surface of all bones, except sesamoid bones. Endosteum is located in bones such as femur, humerus, hip bone, thoracic rib bones and sesamoid bones like patella. This layer of membrane envelopes the spongy tissue, the medullary cavity and the internal lining of the bone’s cavity and the Haversian canal of the marrow. Endosteum is made up of a single-celled layer and s a loose connective tissue, whereas, the periosteum is bilayered in itself, having a fibrous and a cellular layer called cambium and is a dense and irregular connective tissue. Some of its major functions are as follows. The functions of the endosteum and periosteum are somewhat similar and complementary. Bones affected by Paget’s disease are less dense, fragile and vulnerable to fractures. Some infants can experience convulsions. The endosteum (plural endostea) is a thin vascular membrane of connective tissue that lines the inner surface of the bony tissue that forms the medullary cavity of long bones.

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