Medullary cavity

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Medullary cavity
Structure of a Long Bone.png
A long bone, with medullary cavity labeled near center.
Latin cavitas medullaris
TA A02.0.00.037
FMA 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 (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.[1]

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.

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  1. ^ Martini F., & Nath J. L. (2009). Fundamentals of Anatomy and Physiology 8e. San Francisco, CA: Pearson Education Inc.

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