The diaphysis (: diaphyses) is the main or midsection (shaft) of a long bone. It is made up of cortical bone and usually contains bone marrow and adipose tissue (fat).
It is a middle tubular part composed of compact bone which surrounds a central marrow cavity which contains red or yellow marrow. In diaphysis, primary ossification occurs.
Ewing sarcoma tends to occur at the diaphysis.
Additional images
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Illu long bone.jpg
File:EpiMetaDiaphyse.jpg|Long bone
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See also
- Epiphysis
- Metaphysis