Bone Vocab
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18 terms
Terms | Definitions |
|---|---|
 connective tissue has | -ground substance -protein fibers -cells |
| bone matrix | -hydroxyapatite: CaP = 66% bone weight -collagen fibers = 32% bone weight |
| osteoprogenitor cell | -bone stem cells -divide to make osteoblasts -found in periosteum, lining blood vessels, endosteum in medullary cavity |
| osteoblasts | -immature bone cells -produce bone matrix -once surrounded in lacunae become osteocytes -secretes osteoid -> becomes part of the matrix when mineralized |
| osteocyte | -mature bone cells inside of lacunae -do not divide -extension from cells through canaliculi allow communication and nutrient transfer -maintain bone integrity by reverting back to osteoblasts to rebuild |
| osteoclasts | -made from same hematopoetic stem cells as macrophages -breakdown bone for remodeling and to increase Ca blood levels -releases lysomal enzymes and HCL |
| Periosteum | -double layered protective membrane -outer fibrous layer = dense regular CT -inner osteogenic layer = osteoblasts/clasts -supplied by nerve fibers/blood -perforating fibers: secured to underlying bone |
| perforating fibers | -secured to underlying bone -tendons/ligaments attach |
| endosteum | delicate layer of osteoprogenitor cells |
| osteon | lamellae surrounding a central canal |
| central canal | contains blood vessels and nerves |
| perforating canal | allows vessels to move deeper into tissue |
| concentric lamellae | in an osteon |
| interstitial lamellae | pie shaped between osteons |
| circumferential lamellae | layers the outside/inside of bone, touch the periosteum/endosteum |
| lacunae | cavity surrounding the osteocyte |
| canaliculi | -in compact bone canals connecting the lacunae -in spongy bone get nutrients/messages to osteocytes |
| trabeculae | -network of thin branches butting together -align along lines of stress -blood vessel/bone marrow will fill in around trabeculae |
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