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.

Detailed explanation-2: -The medullary cavity is the hollow part of bone that contains bone marrow. The bone marrow makes blood cells and stores fat. Spongy bone (also called cancellous bone) is made up of small, needle-like pieces of bone arranged like a honeycomb.

Detailed explanation-3: -One thing to remember is the functions of the bone cells during growth and development. Osteoclasts are responsible for “hollowing out” the center of long bones, which makes for larger cavities within the diaphysis.