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PT203 Bone Vocab
PT 203 W2 Bone Vocab
Term | Definition |
---|---|
Ossification | Conversion of cartilage to bone. Occurs during the second & thirds months of embryonic life |
Osteoblasts | bone-building cells that become active during the ossification stage |
Collagen | a fibrous protein, intercellular substance giving the tissue strength & resilience |
Osteocytes | a star-shaped cell that remain enclosed after the intercellular material has hardened. they are still alive & continue to maintain the existing bone matrix. They do not produce new bone tissue |
Osteoclasts | large, multi-nucleated cells. responsible for resorption |
Hormones regulating bone formation & resorption | Vitamin D - promotes Calcium absorption from intestine Calcitonin - produced in the thyroid gland. promotes the uptake of calcium by bone tissue Parathyroid (PTH) - produced in the parathyroid glands. causes bone resorption & release of calcium in blood |
Red Marrow | found at the ends of the long bones & the center of other bones |
Yellow Marrow | found mainly in the central cavities of the long bones. composed mostly of fat |
Periosteum | membrane covering the outside of bones. |
Endosteum | lining the bone's marrow cavity. contains cells that also aid in the growth & repair of bone tissue |
Haversian Canal | contains nerves & blood vessels (inside Compact Bone) |
Perforating (Volkmann) Canals | appear from one side of the bone shaft to the other (In Compact Bone) |
What are the 3 primary layers of the skeletal muscles? | Endomysium - around each individual muscle fiber Perimysium - around fascicles (bundles) of muscle fibers Epimysium - around entire muscle; forms innermost layer of deep fascia |
Diaphysis | long, narrow shaft of the long bone |
Medullary | located in the center of the diaphysis (long, narrow shaft of the long bone) containing bone marrow |
Epiphysis | Irregular ends of the long bones |