space within the diaphysis of a mature bone; it contains yellow marrow; also called the marrow cavity

(mehd-YOO-lar-ee KAHV-ih-tee) The potential space within the shaft of a long bone that contains yellow marrow.

Central cavity within a long bone, usually filled with marrow (but air-filled in some bird bones).

Within a long bone, the portion of the diaphysis containing marrow. image

The space within a bone that contains the marrow.

Marrow cavity; central cavity in long bone.

The medullary cavity is the central cavity of bone shafts where yellow marrow (adipose tissue) is stored. Located in the main shaft of the bone (diaphysis), the medullary cavity has walls composed of compact bone and is lined with a thin, vascular membrane (endosteum).