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14 Cards in this Set
- Front
- Back
Normal bone is called?
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Lamellar
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Immature and pathologic bone is called?
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Woven
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Lamellar bone can be these 2 types
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Cortical and Cancellous
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Describe Woven bone compared to Lamellar
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Immature and pathologic, more random with more osteocytes than lamellar bone, increased turnover, weaker, and more flexible than lamellar bone.
Lamellar bone is stress oriented; voven is not |
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This type of bone makes up 80% of the skeleton
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Cortical
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Cortical bone is composed of tightly packed __1__ or __2__ connected by __3__ containing arterioles, venules, capillaries, nerves, and possibly lymphatic channels. __4__ lie b/w Osteons. __5__ frequently connect lamellae but do not cross __6__
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1. osteons
2. Haversion systems 3. Haversion or Volkmann's canals 4. Interstitial lamellae 5. Fibrils 6. Cement lines |
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This is where bone resorption has stopped and new bone formation has begun; also define the outer border of an osteon
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Cement line
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This provides nutrition to cortical bone
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Intraosseous circulation (canals and canaliculi = cell processes of osteocytes)
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Compare Cortical bone to Cancellous bone
-turnover rate -Young modulus -resistance to torsion and bending |
-slower
-higher -higher |
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Osteoblasts form bone by generating this type of matrix
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organic, nonmineralized
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Osteoblasts are derived from these cells
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undifferentiated mesenchymal cells
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More differentiated, metabolically active osteoblasts line this part of bone
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bone surfaces
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Where do less active osteoblasts lie?
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"resting regions" or are entrapped cells and maintain the ionic milieu of bone
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What activates entrapped osteoblasts?
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Disruption of the active-lining cell layer of osteoblasts
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