the lining of the medullary cavity is called periosteum.
the lining of the medullary cavity is called periosteum.
what is the lining of the medullary cavity called?
periosteum
medullary cavity









































the medullary cavity ("medulla", innermost part) is the central cavity of bone shafts where red bone marrow and/or yellow bone marrow (adipose tissue) is stored; hence, the medullary cavity is also known as the marrow cavity. located in the main shaft of a long bone (diaphysis) (consisting mostly of compact bone), the medullary cavity has walls composed of spongy bone (cancellous bone) and is lined with a thin, vascular membrane (endosteum). however, the medullary cavity is the area inside any bone (long, flat, etc.) that holds the bone marrow.
medullary cavity
the ulna is a long bone. the long, narrow medullary cavity of the ulna is enclosed in a strong wall of cortical tissue which is thickest along the interosseous border and dorsal surface. at the extremities the compact layer thins. the compact layer is continued onto the back of the olecranon as a plate of close spongy bone with lamellæ parallel. from the inner surface of this plate and the compact layer below it trabeculæ arch forward toward the olecranon and coronoid and cross other trabeculæ, passing backward over the medullary cavity from the upper part of the shaft below the coronoid. below the coronoid process there is a small area of compact bone from which trabeculæ curve upward to end obliquely to the surface of the semilunar notch which is coated with a thin layer of compact bone. the trabeculæ at the lower end have a more longitudinal direction.
ulna