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Introduction to Skeletal System

Introduction to Skeletal System. Function Protection Support Movement Blood production in tetrapods Mineral storage. Bone make-up. Collagen for strength Hydroxyapatite crystals for hardness Water & mucopolysaccharides for binding Typically osteocytes. Types of bone. Compact bone.

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Introduction to Skeletal System

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  1. Introduction to Skeletal System • Function • Protection • Support • Movement • Blood production in tetrapods • Mineral storage

  2. Bone make-up • Collagen for strength • Hydroxyapatite crystals for hardness • Water & mucopolysaccharides for binding • Typically osteocytes

  3. Types of bone • Compact bone

  4. Compact bone • Osteon • Haversian Canal for blood vessels • Lamellae (lamellar bone) – concentric rings • Osteocytes in lacunae

  5. Types of bone • Spongy bone • Cancellous bone • Trabeculae • Red bone marrow

  6. Types of bone • Acellular • Thin • Cells die and space fills with bone • Fish scales

  7. Types of bone • Membrane bone • Dermal bone • Ontogenetically or phylogenetically from dermis

  8. Types of bone • Replacement • Endochondral • Bone replaces cartilage

  9. Cartilage • Connective tissue • Collagen • Matrix • Chondrocytes

  10. Types of cartilage • Hyaline

  11. Types of cartilage • Fibrous

  12. Types of cartilage • Elastic

  13. Types of cartilage • Calcified cartilage • shark

  14. Skeleton is divided • Axial Skeleton (trunk & skull) • Appendicular Skeleton (girdles & appendages)

  15. Key Points • Which type of bone (compact or spongy) is stronger to resist fracture? Does it depend on the direction of the force causing the fracture?

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