Diaphysis
Shaft of a long bone, containing bone marrow
Diaphysis
The diaphysos (pl.: 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.
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