GENERAL HISTOLOGY

Detailed explanation-1: -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. A long bone, with medullary cavity labeled near center.

Detailed explanation-2: -The diaphysis is the long, curved shaft that contains a central region called the medullary cavity (marrow cavity). It also contains compact bone that is very strong and dense and consists of units called osteons.

Detailed explanation-3: -Compact bone consists of closely packed osteons or haversian systems. The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix. Between the rings of matrix, the bone cells (osteocytes) are located in spaces called lacunae.