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8 Cards in this Set
- Front
- Back
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Endochondral ossification |
Bone develops by replacing hyaline cartilage All bones, except clavicles, below the base of the skull form this way |
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Intramembranous ossification |
Bones develop from a fibrous membrane Forms the cranial bones of the skull and clavicles |
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Primary ossification center |
Shaft region at center of hyaline cartilage |
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Postnatal bone growth |
Long bones- interstitial growth of epiphyseal plate cartilage and its replacement by bone All bones- grow in thickness by appositional growth |
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Proliferation zone (growth long bones) |
Top side of stack next to resting zone Cells quickly divide, pushing epiphysis away from diaphysis and lengthening the entire long bone |
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Hypertrophic zone (growth of lone bones) |
Older chondrocytes in the stack Enlarge leaving large interconnecting spaces |
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Calcification zone (growth of lone bones) |
The sorrounding cartilage matrix calcifies and the chondrocytes die and deteriorate |
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Ossification zone (growth of lone bones) |
Long slender spicules of calcified cartilage Invaded by marrow elements, osteoclasts partly erode cartilage, osteoblasts cover them with new bone Medullary cavity lengthens |
