31. 31
ENDOCHONDRAL OSSIFICATION
(base of skull, vertebral column, bones of extremities, long bone
hyaline
cartilage
zone of
proliferation
zone of
maturation
zone of
hypertrophy
zone of pimary
calicification
primary
spongiosa
(resorption of
calicified
cartilage)
secondary
spongiosa
isogenous nests
of chondrocytes
interstitial growth
columns of chondrocytes
(division in one plane)
enlarged (hypertrophic)
chondrocytes
calcified cartilage
degenerate chondrocyte
calificied cartilage
bone matrix
bony trabeculae
mesenchymal cells