chapt07 v0105 Bone - Chapter 7 Bone Tissue Dynamic tissue...

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1 Chapter 7 Bone Tissue Dynamic tissue that continually remodels itself Bone connective tissue with a matrix hardened by minerals bones make up the skeletal system Functions of the skeletal system support, protection, movement, blood formation, mineral reservoir
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2 Shapes of Bones
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3 Structure of a Long Bone Parts of a long bone are the: Epiphyses (ends) Di aphysis (shaft) Medullary (marrow) cavity Endosteum - contains osteoprogenitor cells Periosteum - membrane around the bone fibrous layer osteogenic layer Articular cartilage - hyaline cartilage covers the surface of joints
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4 HISTOLOGY OF BONE Bone consists of widely separated cells surrounded by large amounts of matrix Four principal types of cells: 1. osteoprogenitor cells - unspecialized can divide 2. osteoblasts - form bone, secrete collagen 3. osteocytes – former osteoblasts, strain sensors that detect stress in the bone and talk to osteoblasts on the bone surface 4. osteoclasts - reabsorb bone
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5 BONE HISTOLOGY (cont.) Matrix contains some calcium carbonate, calcium phosphate but mostly hydroxyapatite , which is the PRIMARY salt that makes bone hard. Matrix is deposited in a framework of collagen fibers, - calcification or mineralization salts confer hardness on bone collagen fibers give tensile strength Matrix (Bone) composition = 25% water, 25% protein fibers and 50% minerals
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6 Compact Bone Bone may be categorized as compact or spongy Dense bone tissue consists of osteons
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