Skeletal system Chapter 5
Skeletal system functions
Skeletal system components connective tissues
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
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