Medullary cavity

 ( Skeletal System ) 

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 spongy bone), the medullary cavity has walls composed of compact bone (cortical bone) and is lined with a thin, vascular membrane (endosteum).

Gerard J. Tortora (2025). 9780730392002, Wiley. ISBN 9780730392002

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 occurring in some forms of cancer or benign tumors such as an enchondroma.

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Comparative anatomy This area is involved in the formation of red blood cells and white blood cells,

In some dinosaurs, reptiles, and birds, a medullary bone grows here, which supplies the calcium supply for . This has been detected in fossil bones despite the fossilization process.

It is not found in Crocodile or reptiles.

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