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Diaphysis
The diaphysis 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’s sarcoma tends to occur at the diaphysis.
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Epiphysis
The epiphysis is the rounded end of a long bone, at its joint with adjacent bone(s). Between the epiphysis and diaphysis (the long midsection of the long bone) lies the metaphysis, including the epiphyseal plate (growth plate). At the joint, the epiphysis is covered with articular cartilage; below that covering is a zone similar to the epiphyseal plate, known as subchondral bone.
The epiphysis is filled with red bone marrow, which produces erythrocytes (red blood cells).
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Diaphysis (noun)
The central shaft of any long bone.
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Diaphysis (noun)
An abnormal elongation of the axis of a flower or of an inflorescence.
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Epiphysis (noun)
The pineal gland.
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Epiphysis (noun)
The rounded end of any long bone.
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Epiphysis (noun)
A small upper piece of each half of an alveolus of a sea urchin.