of a long bone
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Longitudinal Growth | endochondral ossification at epiphyseal plates
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| Zone of Reserve Cartilage | next to epiphysis; irregularly scattered small chondrocytes; chondrocytes here anchor the epiphyseal plate to the epiphysis
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| Zone of Proliferating Cartilage | larger chondrocytes stacked like coins are seen; these chondrocytes undergo mitosis to make new chondrocytes causing expansion of the plate
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| Zone of Hypertrophic Cartilage | even larger chondorcytes occur in columns; here chondrocytes mature
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| Zone of Calcified Matrix | a few layers, mostly dead cells; osteoclasts break it down; osteoblasts from diphysis lay down bone with osteocytes trapped inside --the metaphysis is the region where calcified matrix is replaced by bone to form the epiphyseal line
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| Lengthwise Growth | evidence is the epiphyseal line 16-18 years of life- 20-25 is when epiphyseal cartilage is replaced by bone
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| Circumferential Bone Growth | intramembranous ossification; periosteal osteoblasts deposit new bone on the periosteal surface of the diaphysis; endosteal osteoclasts break down old bone (marrow cavity enlarges and minderal ions are released into the blood)
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Created by:
sc26
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