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The endosteum (pl.: 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. [1] [2] This endosteal surface is usually resorbed during long periods of malnutrition, resulting in less cortical thickness. [citation needed]
The endosteum refers to a layer of connective tissue that line the inner surfaces of bones including both the medullary (marrow) cavity of compact bone and the thin spicules or trabeculae of cancellous (spongy) bone.
Periosteum and endosteum contain cells (osteoblasts, osteoclasts, and osteoprogenitor cells) required for bone development and remodeling of the bone. Understanding the histology of the endosteum and periosteum will help to decode the pathological conditions of bone.
The endosteum is a thin osteogenic layer that is lined with osteoblasts and precursors to osteoblasts. In times of inactivity, these cells are flat and are not easy to distinguish from each other. Upon activation, osteoblasts become cuboidal and are capable of producing osteoid which forms new lamellar bone.
Lining the inside of the bone adjacent to the medullary cavity is a layer of bone cells called the endosteum (endo- = “inside”; osteo- = “bone”). These bone cells (described later) cause the bone to grow, repair, and remodel throughout life.
What is Endosteum? Endosteum is a thin, soft, connective tissue, lining the cavity of long bones like Humerus and Femur. It acts as a coating for the inner compact bone and the trabeculae of the spongy tissue.
Endosteum is a thin, vascular membrane lining the inner surface of bones. It covers the medullary cavity, trabeculae of spongy bone, and the inner surfaces of the central canals of compact bone.
What Is Endosteum? Endosteum is a structure found on the inner surface of the bone. It is a membrane layer that coats the medullary cavity, bony trabeculae; the spongy part of the bone, inner walls of the compact bones and haversian canals. 1
The endosteum is a structure in the middle of bone tissue and bone marrow. It is a thin covering that surrounds the medullary cavity. It coats the inner compact bone and the trabeculae of the spongy bone.
Lining the surface of the medullary cavity is a thin layer of connective tissue known as the endosteum, containing cells required for bone development and remodeling. The medullary cavity is important for housing the body's bone marrow stores.