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13 Cards in this Set
- Front
- Back
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characteristics
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specialized for weight support
dynamic, highly vascularized major mineral storage area (deposit calcium in bone) gives to other parts later |
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Functions
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support and protection
movement hematopoiesis (blood cell formation) (red marrow blood cells and platelets, yellow marrow fat) storage - calcium phosphate |
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Composition
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cells
(osteoblast, osteocyte, osteoclast) bone matrix |
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osteoblast
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produces organic matrix of bone. uses type 1 collagen (fibers in layers), ground substance, and chondroitin sulfate
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osteocyte
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smaller than osteoblasts, cell type mature. non dividing, has own lacunae
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osteoclast
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take away bone. non mitotic. Dissolve bone by absorbing surface in depressions. ruffle the border of precessions to increase surface area of cell to bone. allws extracellular digestion. focal decalcifiication occurs first by buildup of organic acids under ruffled border
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bone matrix
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read through different processes
calcification ossification osteoid tissue |
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Periosteum
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highly vascularized CT covering external surface of bone. an outer layer and inner layer
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Bone Canaliculi
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canals within ossified matrix. interconnect lacunae and ensure that all surfaces of the osteocyte are bathed by tissue fluid. Miniature lifeline to osteocytes
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Bone types
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spongy - lots of spaces, each of which contains marrow. inside every bone
compact - no marrow spaces. tightly packed units called osteons. creates outer surface of every bone |
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Compaction
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transforms spongy bone to compact bone. Fill in space between spicules of spongy bones. osteoblasts deposit new osteoid material in layers. Marrow spaces are eventually gone leaving compact bone. Some spongy remains
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Haversian Canal System
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osteon - unit formed by the filling of marrow spaces.
osteon built around a blood vessel of old marrow space. osteon appears as ring of tissue. Inner space is Haversian canal |
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Volkman's canals
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passageway linking Haversian canals
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