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Osseous Tissue: Structure and Function

Explore the microscopic anatomy of bone tissue, from osteocytes to canaliculi, and learn about the classification of bone by tissue type. Discover the roles of osteoblasts, osteoclasts, and collagen fibers in providing strength and flexibility to bones.

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Osseous Tissue: Structure and Function

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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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