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| mature bone cells surrounded by bone |
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| cell that reabsorbs bone or takes it away |
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| 5 functions of bone tissue |
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Definition
1. structural support
2. storage for minerals
3. blood cell production
4. protection
5. leverage |
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| cancellous/trabecular bone |
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Definition
| spongy bone on inside near ends |
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| a haversian system, structural unit of compact bone with central vascualr canal |
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| allows passage of nutrients vertically thru compact bone |
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| allows passage of nutrients horizontally then connects to haversian canals |
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| depressions for osteocytes |
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| allows different bone cells to communicate |
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| flared ends on shaft of bone |
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| shaft-structure in middle of long bone |
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| in middle for yellow marrow, red marrow is in cancellous bone |
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| thin tissue covering outer surface of bones not covered in cartilage; missing in dry bones |
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| inner surface of bone lined with this cellular membrane |
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| supplies nutrients to bone thru nutrient foramen |
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| attach muscle to bone, allow movement |
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| hold bones in place & limit movement |
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| on joint surfaces, rib cage, makes bone in embryo |
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| harder but allows for small movements |
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1. Synarthroses
2. Amphiarthroses
3. Diarthroses |
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| fibrous- allow little movement (sutures on skull) |
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| (cartilagenous)provide some movement, adapted for growth, at pubic symphasis |
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| Types of Diarthroses joints |
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Definition
1. Ball & Socket - hip and shoulder
2. Hinge - elbow and knee
3. Pivot - head and twist of arm
4. Gliding - wrist and ankle
5. Saddle - thumb
6. Condyloid - round surfaces ex. fingers |
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| movement toward medial line |
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| movement away from medial line |
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| increase in size due to multiplication of cells |
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| enlargement of existing cells (cellulite and fat) |
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| osteoblasts produce new bone cells to mature into osteocytes |
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Term
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Definition
bone growth on outside to make sure bone keeps shape
- osteoblasts generate new bone while osteoclasts degenerate bone to keep proper shape |
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Term
| Endochondral Development (in mandible) |
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Definition
- hyaline cartilage model forms in embryo
- bone collar forms on outside
- marrow cavity starts forming in center
- blood vessels begin to nourish bone
- cancellous bone starts forming at ends of bone
- epiphyseal (growth) plate makes ends seperate from center but disappears as you age |
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| Intramembranous Development (in skull) |
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Definition
- membrane with osteocytes start to form spongy bone
- osteoblasts move to outside to form hard bone |
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| longest and strongest growth? |
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