Periosteum & endosteum

Endosteum

Endosteum covers the inside of bones, and surrounds the medullary cavity. 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.

Periosteum vs endosteum

Endosteum stimulates bone resorption on the inner bone surfaces and periosteum stimulates formation of the new bone on the outer bone surfaces — this way the diameter of the medullary canal and the bone as a whole increases with age

Endosteum

The endosteum an incomplete cellular layer, lines the marrow cavity. This layer which is active during bone growth, repair, and remodeling, covers the trabeculae of spongy bone and lines the inner surfaces of the central canals.

Periosteum

The periosteum a membrane with a fibrous outer layer and a cellular inner layer. The periosteum isolates the bound surrounding the tissue, provides a route for the circulatory and nervous supply and actively particiapates in bone growth and repair.

Periosteum

This connective tissue is made up of two different layers: The fibrous periosteum is the outer layer furthest away from the bone. The cells in this layers are densely packed, and it contains lymphatics, blood vessels and nerve endings. The osteogenic periosteum is the inner layer that lies right on top of the bone.