Skeletal tissue

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Skeletal tissue

  1. 1. Skeletal tissue and system
  2. 2. Skeletal system Bones and cartilage Protect organs Allow for motion
  3. 3. Orthopaedics (Orthopedics) Medical specialty for restorative treatment of skeleton and articulations (joints) and associated connective tissue
  4. 4. Skeletal system tissue Cartilage Bone Dense connective
  5. 5. Skeletal system functions Support Protection Movement (along with attached muscle) Mineral Storage (calcium) Storage and production of blood cell – red marrow (hematopoiesis) Energy storage -yellow marrow
  6. 6. Bone tissue cell types
  7. 7. Osteogenic (osteoprogenitor) cells From mesenchyme Can proliferate (mitosis) Can differentiate In periosteum, endosteum and canalicula
  8. 8. Osteoblasts Form bone Produce & secrete organic (collagenous) components Produce & secrete mineral salts (hydroxyapatite; calcium phosphate, calcium carbonate) Can no longer divide
  9. 9. Osteocytes Major cell of bone tissue “Mature” bone cells Maintain bone Trapped in their own secretions
  10. 10. Osteoclasts Reabsorb bone (degrade bone) Critical for remodeling and development and repair Located on bone surface
  11. 11. Types of bone
  12. 12. Long bone structure Diaphysis – shaft / main portion Epiphysis – ends Metaphysis – btwn dia & epiphysis Cartilage – hyaline for shock absorption and friction reduction Periosteum – dense covering of two layers for growth, repair & attachments Elastic fibers and blood vessels Osteogenic, -clast & -blast cells
  13. 13. Long bone structure Medullary cavity (bone marrow) Within diaphysis Yellow bone marrow in adults Fat and blood cells Endosteum – lines medulla Osteoblasts and clasts
  14. 14. Compact bone and spongy bone
  15. 15. Compact and spongy bone
  16. 16. Compact bone characteristics Little space Thick in diaphysis Thin in epiphysis Protection and support
  17. 17. Compact bone structure Rings of bone material - Osteons – Contain osteocytes – Lacunae – space in which osteocytes are trapped – Canaliculi – connect to lacunae, “little canals” for nutrient and waste distribution – Central canals – lead to perforating canals
  18. 18. Spongy bone
  19. 19. Spongy bone No true osteons Trabeculae – irregular thin bone plates Red marrow between trabeculae Produces blood cells Osteocyte containing lacunae within trabeculae
  20. 20. Bone Formation Intramembranous Ossification Formation of bone within fibrous membranes Forms flat bones of skull Endochondral ossification Most common type of bone formation Bone forms from cartilage
  21. 21. Intramembranous Ossification
  22. 22. Intramembranous Ossification
  23. 23. Endochondral Ossification
  24. 24. Endochondral Ossification
  25. 25. Endochondral Ossification
  26. 26. Bone disorders Osteoporosis
  27. 27. Bone disorders Osteomalacia (rickets in children)
  28. 28. Bone disorders Osteomyelitis
  29. 29. Bone disorders Osteoarthritis
  30. 30. Bone disorders
  31. 31. Bone fractures
  32. 32. Bone repair
  33. 33. Calcium Homeostasis PTH (parathyroid hormone) Calcitonin

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