diaphysis
Noun
Meaning
An abnormal prolongation of the axis of inflorescence.
The shaft, or main part, of a bone, which is first ossified.
Source: Webster's dictionarySynonyms
shaft
rod
body
core
column
stem
cylinder
pillar
spindle
trunk
long bone
endosteum
diploe
dense bone
compact bone
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The diaphysis and both epiphyses of a long bone are separated by a growing zone of cartilage (the epiphyseal plate ).
When the child reaches skeletal maturity (18 to 25 years of age), all of the cartilage is replaced by bone, fusing the diaphysis and both epiphyses together (epiphyseal closure).