| Medullary Cavity | |
|---|---|
 A long bone, with medullary cavity labeled near center. | |
| Details | |
| Identifiers | |
| Latin | cavitas medullaris |
| TA98 | A02.0.00.037 |
| TA2 | 386 |
| FMA | 83698 |
| Anatomical terminology | |
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 (cancellous bone) and is lined with a thin, vascular membrane (endosteum).[1][2]
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.
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 eggshells. This has been detected in fossil bones despite the fossilization process.[3] It is not found in crocodiles or reptiles.[4]
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