Postnatal Craniofacial Development Flashcards
where does endochondral bone growth occur
long bones
what happens in endochondral growth
replacement of the cartilage matrix by an osseous matrix
what does indirect growth involve
growth centers or growth plates
what is the long bone growth pattern
indirect growth
describe indirect growth
- genetically programmed
- mechanical stress: pressure/tension no effect
-highly organized
what happens at growth plates or centers
- where the cartilage matrix is replaced by immature bone
- genetically programmed
when does the spheno-ethmoidal synchondrosis form
6 years
is the chondrocranium genetically programmed
yes
what happens in intramembranous bone growth
replacement of connective tissue with bony tissue
what types of bones does intramembranous bone growth occur in
irregular bones
what does intramembranous growth result in
displacement of other structures in space
describe the process of lamellar or cortical bone formation
- mesenchymal cell -> osteoblasts -> ossification center -> osteoid (unmineralized bone) -> calcification -> osteocytes -> lamellar or cortical bone
where does bone formation in intramembranous ossification occur
directly in a vascularized mesenchyme
what is resorption-apposition
new bone forms on the external aspect of the bone while bone is resorbed on the internal aspect
what is the V principle of enlow
-a bony structure will be displaced during growth
- to preserve shape, parts of the bone will receive new bone and parts will resorb
