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18 Cards in this Set
- Front
- Back
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Types of cells of bone tissue |
Osteogenic cells, osteoblasts, bone lining cells, osteocytes, and osteoclasts |
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Osteogenic cells |
Mitotically active stem cells found in periosteum and endosteum Can be flattened or squamous |
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Osteoblasts |
Bone forming cells that secrete the bone matrix, actively mitotic Secrete collagen and osteoid Cube shaped when active |
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Osteocytes |
Monitor and maintain the bone matrix Act as strain sensors and respond to mechanical stimulus Occupy lacunae that conform to their shape |
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Bone lining cells |
Flat cells found on bone surfaces Help maintain the matrix |
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Osteoclasts |
Giant multinucleate cells located at sites of bone resorption Rest in shallow depression when actively resorbing bone |
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Osteon (Haverisan system) |
An elongated cylinder oriented parallel to long axis bone |
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Lamella |
Matrix tube that is involved in the creations of bone matrix |
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Central canal (Haverisan canal) |
Runs through the core of each osteon Contains small blood vessels and nerve fibers that serve the osteons cells |
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Perforating canal (Volkmann's canals) |
Lie at right angles to the long axis of the bone Connect the blood and nerve supply of the mudullary cavity to central canals Lined with endosteum |
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Canaliculi |
Tie all the osteons in the Osteon together, allows for communication |
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Interstitial lamellae |
Either fill the gaps between forming osteons Are remnants of osteons that have been but through by bone remolding |
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Circumferential lamallae |
Located just deep to the periosteum and just superficial to the endosteum Extends around the entire circumference of the diaphysis Reists twisting of the lone bone |
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Trabeculae |
Contains irregularly arranged lamellae and osteocytes interconnected by canaliculi No osteons present |
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Chemical comp. of bone |
Organic- bone cells and osteoid Inorganic-mineral salts |
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Osteoid |
Makes up 1/3 of matrix Includes ground substance and collagen fibers |
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Organic components |
Contribute both to a bone's structure and to the flexibility and tensile strength that allow it to resist stretch and twist |
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Inorganic components |
Present as tiny, tightly packed, needle like crystals in and around collagen fibers in extracellular matrix |
