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Small, irregular bones found between the flat bones of the skull |
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Have complex shapes
Examples are: spinal vertebrae, pelvic bones |
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small and thick
Example: ankle and wrist bone |
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Thin with parallel surfaces found in the skull, sternum, ribs, and scapulae |
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long and thin
found in arms, legs, hands, fingers, feet, and toes |
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Small and flat that develop inside tendons near joints of knees, hands, and feet |
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The shaft; a heavy wall of compact bone, or dense bone |
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Wide part at each end of bone; mostly spongy (cancellous) bone |
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Where diaphysis and epiphysis meet |
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Resembles a sandwich of spongy bone; Between two layers of of compact bone |
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Form pathways for blood vessels; Exchange nutrients and waste |
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Help synthesize bone proteins |
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Mature bone cells that maintain the bone matrix; Do not divide |
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TWO MAJOR FUNCTIONS OF OSTEOCYTES |
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1. To maintain protein and mineral content of matrix
2. To help repair damaged bone |
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Immature bone cells that secrete matrix compounds (osteogenesis); osteoblasts surrounded by bone become osteocytes |
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Mesenchymal stem cells that divide to produce osteoblasts; assist in fracture repair |
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Secrete acids and protein-digesting enzymes; dissolve bone matrix and release stored minerals (osteolysis) |
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Bone building (by osteoblasts) and bone recycling (by osteoclasts) must balance |
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The basic unit of compact bone |
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1. Isolates bone from surrounding tissues
2. Provides a route for circulatory and nervous supply
3. Participates in bone growth and repair |
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The process of replacing other tissues with bone |
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ENDOCHONDRAL OSSIFICATION |
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Ossifies bones that originate as hyaline cartilage; most bones originate as hyaline cartilage |
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INTRAMEMBRANOUS OSSIFICATION |
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Also called dermal ossification; Produces dermal bones such as mandible (lower jaw) and clavicle (collarbone) |
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Required for collagen synthesis, and stimulation of osteoblast differentiation |
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Stimulates osteoblasts activity |
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