The diaphysis (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).

Diaphysis
A long bone, with the diaphysis labeled at right.
Details
Pronunciation/dˈæfɪsɪs/ dy-AF-iss-iss[1][2]
Part ofLong bones
Identifiers
MeSHD018483
TA98A02.0.00.017
TA2391
FMA24013
Anatomical terminology

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.[3]

Additional images

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See also

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References

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  1. ^ OED 2nd edition, 1989.
  2. ^ Entry "diaphysis" in Merriam-Webster Online Dictionary.
  3. ^ Physical Medicine and Rehabilitation Board Review, Cuccurullo