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1-31-07 notes - Ÿ Medullary cavity yellow marrow Ÿ...

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-1 Skeletal system (ch. 6) Ch. 7: 146-174 Ch. 8: 178-196 Endoskeleton Grows throughout life 1. Support: rigid framework for softer tissues and organs 2. Protection: brain and spinal cord, organs 3. Body movement: anchor sites for muscles, levers 4. Mineral Storage: calcium, phosphorus 5. Hemopoiesis: blood formation 206 total bones Axial: skull (auditory ossicles), hyoid, spine, rib cage: 80 Appendicular: pectoral girdle, arms, pelvic girdle, legs: 126 Others: wormian (forms in the middle of a suture), sesamoid (patella, FPB, FHB) Babies don’t have patellas Ÿ Bones in 4 different categories Ÿ Long (elongated axis) Ÿ Shaft is called Diaphysis Ÿ Bulbous portions are Epiphysis Ÿ Covered at the end with cartilage (Hyalin) Ÿ Compact: not as porous, Spongy: porous Ÿ In the middle is the medulary cavity (yellow bone marrow) Ÿ Outside lining of bone: periostemon (attachment for tendons and ligaments) Ÿ Inside lining of bone: endosteum Ÿ Ÿ Short (chunks, no axis) Ÿ Flat: (two plates molded together Ÿ Diploe, compact spongy and compact again (sandwiched)
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Unformatted text preview: Ÿ Medullary cavity: yellow marrow Ÿ Hemopoiesis: 2.5million RBC’s every second Ÿ Irregular (everything else) Ÿ Bone is composed of several different bone cells in a matrix of ground substance, salts (calcium & phosphorus), and collagen fibers. Ÿ Composite material: flexibility and strength Ÿ Bone cells: Ÿ Estrogenic: immature bone cell in eriostemon and endosperm, responds to injury (osteoblasts and osteoclasts) Ÿ Osteoblasts: form bone and will become osteocytes Ÿ Osteocytes: mature bone cells. Ÿ Osteoclasts: reabsorbed of bone tissue Ÿ Bone-lining: thought to cover bone and regulate mineral movement in and out of bone Ÿ Trabeculae: shock absorbing, “tiles” Ÿ Parts of bone Ÿ Osteon (haversian system) (column) Ÿ Lamellae (concentric rings) Ÿ Osteocyte Ÿ Lacuna Ÿ Canaliculus Ÿ Central (haversian) canal Ÿ Perforating (Volkmann’s) canal Figure 1.11 Figure 1.12 Figure 4.1 Figure 5.3 Figure 6.3 Figure 6.6...
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