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 (cortical bone) 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. The clavicle is the only long bone that does not contain a medullary cavity.
This area is involved in the formation of red blood cells and white blood cells.
Intramedullary is a medical term meaning the inside of a bone. Examples include intramedullary rods used to treat bone fractures in orthopedic surgery and intramedullary tumors occurring in some forms of cancer or benign tumors such as an enchondroma.
Other articles related to "medullary cavity":
... the formation of connective tissue in the medullary cavity of the affected bone ... Pain may be caused by increased pressure in the medullary cavity and the stimulation of pain receptors in the periosteum ... X-rays may show an increased density in the medullary cavity of the affected bones, often near the nutrient foramen (where the blood vessels enter the bone) ...