BONE DEVELOPMENT - BONE DEVELOPMENT Ossification...

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BONE DEVELOPMENT Ossification/ odontogenesis: development of bone Axial: skull, bones of cranium, vertebral column, bones of pelvic girdle, sternum Appendicular: limbs, clavicle, scapula Long bones: femur, tibia, fibula Short bones: carpals+ tarsals Flat bones: that protect the brain; parietal (skull bones) Irregular bones: bones of vertebrae (highly specialized bones) Primary ossification center: diaphysis Secondary ossification center: epiphysis More dense towards primary ossification center bones
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TWO TYPES OF OSSIFICATION: 1) ENDOCHRONDRAL OSSIFICATION: within cartilage; cartilaginous precursor transformed to bone 2) INTRAMEMBRANOUS OSSIFICATION:within membrane - no cartilaginous precursor - Refers to flat bones of skull which develop in the membrane surrounding the developing brain MESENCHYMAL OSSIFICATION not within membrane - Most of the skeleton formed via endochrondral ossification - Flat bones, skull, scapula intramembranous/ mesenchymal *osteogenesis occurs around 6 weeks gestation
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