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

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-1Skeletal 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: Medullary cavity: yellow marrow Hemopoiesis: 2.5million RBCs every second Irregular (everything else) Bone is composed of several different bone cells in a matrix of ground substance, salts (calcium & phosphorus), and collagen fibers. Composite material: flexibility and strength Bone cells: Estrogenic: immature bone cell in eriostemon and endosperm, responds to injury (osteoblasts and osteoclasts) Osteoblasts: form bone and will become osteocytes Osteocytes: mature bone cells. Osteoclasts: reabsorbed of bone tissue Bone-lining: thought to cover bone and regulate mineral movement in and out of bone Trabeculae: shock absorbing, tiles Parts of bone Osteon (haversian system) (column) Lamellae (concentric rings) Osteocyte Lacuna Canaliculus Central (haversian) canal Perforating (Volkmanns) canal Figure 1.11 Figure 1.12 Figure 4.1 Figure 5.3 Figure 6.3 Figure 6.6...
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1-31-07 notes - Medullary cavity: yellow marrow...

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