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Osseous Tissue (Histology)

Osseous Tissue (Histology). Osseous Tissue. 1. Cells Osteocytes— mature bone cells Osteoblasts— bone-forming cells (germ cells or “bud” cells) Osteoclasts —bone-destroying cells (“breakers”) A. primarily collagen fibers flexibility

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Osseous Tissue (Histology)

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  1. Osseous Tissue (Histology)

  2. Osseous Tissue 1. Cells • Osteocytes— mature bone cells • Osteoblasts— bone-forming cells (germ cells or “bud” cells) • Osteoclasts —bone-destroying cells (“breakers”) A. primarily collagen fibers • flexibility • tensile strength (the strength to endure stretching forces) B. calcium salts (hardness) • contain calcium and phosphorus • great compressional strength (the strength to endure squeezing forces) 2. Matrix

  3. Classification of Bone by Tissue Type Two basic types of Tissue 1. Compact bone • Homogeneous • Looks “smooth” 2. Spongy bone • Small needle-like pieces of bone • Many open spaces (like sponge) • Keep bones light Figure 5.2b

  4. Microscopic Anatomy of Bone Figure 5.3a http://www.youtube.com/watch?v=4qTiw8lyYbs&NR=1

  5. Microscopic Anatomy of Bone • Osteon (Haversian system) • A unit of bone containing central canal and matrix rings • Central (Haversian) canal • Opening in the center of an osteon • Carries blood vessels and nerves • Perforating (Volkman’s) canal • Canal perpendicular to the central canal • Carries blood vessels and nerves

  6. Microscopic Anatomy of Bone • Lacunae • Cavities containing bone cells (osteocytes) • Arranged in concentric rings • Lamellae • Rings around the central canal • Sites of lacunae • Canaliculi • Tiny canals • Radiate from the central canal to lacunae • Form a transport system connecting all bone cells to a nutrient supply

  7. Microscopic Anatomy of Bone Figure 5.3b–c

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