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Osseous Tissue & Skeletal Structure. I. Structure of Bone. The Skeletal System: Primary Function. Support Storage: Minerals (Ca, PO 4 - ) & Lipids Blood Cell Production Protection Leverage. Osseous (Bone) Tissue Components. Connective tissue Calcium salts
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Osseous Tissue & Skeletal Structure I. Structure of Bone
The Skeletal System:Primary Function • Support • Storage: Minerals (Ca, PO4-) & Lipids • Blood Cell Production • Protection • Leverage
Osseous (Bone) Tissue Components • Connective tissue • Calcium salts • Osteocytes (bone cells) within lacunae (pockets) • Canaliculi-small canals feed osteocytes • Periosteum (fiber out,cellular in) • Figure 6-1c
Bone Matrix • Ca3(PO4)2 + Ca(OH)2--> Ca10(PO4)6(OH)2 • calcium phosphate + calcium hydroxide-> hydroxyapatite Compression • Collagen fibers (protein) Tension • Osteocytes & other cell types
Bone Cells • Osteocytes-mature bone cells within lacunae sandwiched between lamellae layers • recycle calcium & repair damaged bone • Osteoblasts-cuboidal & produce new bone • become osteocytes • Osteoprogenitor cells-stem cells • Osteoclasts-multinucleated WBC, osteolysis
Compact Dense/Solid walls Osteon- Haversian Canal Canals of Volkman Spongy Open inner network /surrounds marrow trabeculae=struts Compact & Spongy Bones
Periosteum outer surface of bone fiber out/cellular inner 1.isolates bone 2.provides circulatory and nerve supply 3.bone growth & repair Endosteum lines marrow cavity, trabeculae & central canals growth,repair, remodel Periosteum & Endosteum
Discussion Questions • What is bone tissue specilaized for? • Where do osteoblasts come from? Give function • From what do osteoclast arise? Give function • What are the inner and outer layers of tissue covering bone? Give function • How does calcification differ from ossification? • How do the two types of bone differ? • Around what structure are osteons organized?