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Skeletal System Overview

Skeletal System Overview

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Skeletal System Overview

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  1. Skeletal System Overview Chapter 7 p. 192 – p. 204

  2. Function of the Skeletal System • Support of body and organs • Protection of soft tissues • Allow attachment of muscles • Housing of blood-producing cells

  3. What makes up bone? • Osteocytes with extracellular matrix • Osteocytes are found in lacunae (holes in the bony matrix) • Extracellular matrix is made up of collagen and inorganic salts

  4. Types of Bones • Long bones • Short bones • Flat bones • Irregular bones • Sesamoid bones

  5. Long Bones • Epiphysis • Articular Cartilage • Diaphysis • Periosteum • Spongy bone • Compact bone

  6. Spongy Bone • Trabeculae: branching bony plates • Space between the bony plates allows for cushion

  7. Compact Bone • Made up of osteons • Circular units with central blood vessels and nerves • Also called Haversian systems

  8. Osteon

  9. Volkmann’s Canals

  10. Short Bones • Make up hands and feet

  11. Flat Bones • Scapula (shoulder blade) • Skull • Ribs

  12. Irregular Bones • Vertebrae • Facial bones

  13. Sesamoid Bones • Not always a separate category • Round bones • Patella

  14. Bone Marrow

  15. Bone Marrow • Blood production • Red marrow: produces red blood cells, white blood cells and platelets • White marrow: fatty tissue

  16. Bones under the microscope

  17. Osteoporosis

  18. Bone Development

  19. Bone Development • Hyaline Cartilage • Ossification • Epiphyseal Cartilage (epiphyseal plate)

  20. Fractures • Greenstick • Communicated • Transverse • Oblique • Spiral • Compound

  21. Fractures

  22. Bone Repair • Hematoma forms (blood released from vessels within the bone) • Formation of spongy bone and fibrocartilage • Bony callus • Osteocytes, osteoblasts and osteoclasts

  23. Functions of the Skeletal System • Support • Protection • Movement • Origin and insertion of muscle • Origin: immovable end of the muscle • Insertion: movable end – during contraction, insertion will move toward the origin