Bone Tissue

Bone Tissue - BONE TISSUE ASSIGNED READING: PAGES 214-232...

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BONE TISSUE ASSIGNED READING: PAGES 214-232 IN SALADIN 5TH EDITION
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FUNCTIONS OF THE SKELETON Support Protection Movement Electrolyte balance Blood formation
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SHAPES OF BONES Long bones longer than wide Short bones equal in length and width Flat bones Irregular bones elaborate shapes that don’t fit into the other categories Femur Scapula Sternum Sphenoid bone Radius Ulna Irregular bones Flat bones Short bones Long bones Vertebra Capitate (carpal) bone Talus
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STRUCTURE OF A LONG BONE Terms to know: epiphyses and diaphysis articular cartilage compact and spongy bone marrow cavity periosteum and endosteum Living Dried Marrow cavity Periosteum Nutrient foramen Site of endosteum Compact bone Spongy bone Epiphysis Epiphysis Diaphysis Articular cartilage Epiphyseal line Red bone marrow Yellow bone marrow Epiphyseal line Articular cartilage
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STRUCTURE OF A FLAT BONE Two layers of compact bone enclosing a middle layer of spongy bone both surfaces of flat bone covered with periosteum Diploe – spongy layer in the cranium absorbs shock marrow spaces lined with endosteum Suture Outer compact bone Spongy bone (diploe) Inner compact bone Trabeculae
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Cells: 1. osteogenic cells 2. osteoblasts 3. osteocytes 4. osteoclasts HISTOLOGY OF OSSEOUS TISSUE Osteogenic cell Osteoblast Osteocyte Osteocyte development Stem cells Osteoclast Fusion Osteoclast development
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THE MATRIX Organic matter (1/3 weight) collagen, carbohydrate – protein complexes, such as glycosaminoglycans, proteoglycans, and glycoproteins Inorganic matter (2/3 weight) 85% hydroxyapatite (crystallized calcium phosphate salt) calcium carbonate other minerals (fluoride, sodium, potassium, magnesium) rickets – soft bones due to
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THE MATRIX Mineral Deficiency: Rickets – soft bones due to deficiency of calcium salts Organic Deficiency: Osteogenesis imperfecta (brittle bone disease) – excessively brittle bones due to lack of protein, collagen
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osteon (haversian system) – the basic structural unit of compact bone Formed by a central canal and its concentric lamella Cells reside in lacunae , connected to each other by
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This note was uploaded on 11/04/2011 for the course BIOL 252 taught by Professor Johnson during the Fall '07 term at UNC.

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Bone Tissue - BONE TISSUE ASSIGNED READING: PAGES 214-232...

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