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Support tissues - Bone (Functions of bone (Support, Protection, Movement,…
Support tissues - Bone
Properties of Bone
Cells
Osteoblast
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Found in periosteum (fibrous layer surrounding outside of bone) and endosteum (cellular layer lining bone cavity)
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Osteoclast
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Fusion of many macrophages, multinucleate and large. Ruffled border
Destroy bone matrix for:
- General turnover of bone
- Re-modelling of bone during growth
- Fracture repair
- Response of bone to changing mechanical stresses
- Increasing Ca2+ levels in blood
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Adult bone
Lamellar (layered)
Compact
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In longitudinal section: Osteocyte lacunae appear as elongated brown specks arranged in concentric layers around Haversian canals
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Haversian system/osteon
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Great strength
Long bones a macroscopic cylinder, with walls made of microscopic cylinders
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Remodelling of Bone: Growth, Stress and Repair
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