Skeletal system Chapter 5.

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Presentation transcript:

Skeletal system Chapter 5

Skeletal system functions

Skeletal system components bone

Bones classified by shape long short flat irregular

Bone histology Organic component Inorganic components

Bone cells osteoblasts osteocytes osteoclasts

Compact bone osteon

Compact bone

Spongy bone has trabeculae

Anatomy of a long bone Diaphysis Epiphyses (sing. epiphysis) Epiphyseal line (growth plate)

Bone development (ossification)

Developmental growth Elongation of long bones

Bone homeostasis: remodeling new bone formation & reabsorption (destruction)

Bone homeostasis: remodeling may be under hormonal control goal is to maintain proper blood Ca2+ levels

Bone homeostasis: repair of fractures, what happens? hematoma forms cartilaginous callus forms bony callus forms remodeling of bone

Bone homeostasis: repair of fractures, what happens?

Homeostatic imbalances of bone Osteoporosis

Homeostatic imbalances of bone Osteomalacia

Pathologies Fibrodysplasia ossificans progressiva

Divisions of skeletal system

Joint basics

Joint classification Three broad categories

Synovial joint structure

Stability of synovial joints

Stability of synovial joints ligaments

Joint disorders Degenerative changes: arthritis osteoarthritis rheumatoid arthritis

Joint disorders

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