Chapter_6 - KIN 216 Applied Human Anatomy Chapter 6 Slides...

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Unformatted text preview: KIN 216 Applied Human Anatomy Chapter 6 Slides adapted from Dr Pfeiffer Skeletal System • Consists of bones, cartilages, and joints • The framework of our body • 95% of body’s Ca stored in skeleton (DYNAMIC process- comes and goes) • **206 bones in an adult skeleton • You have more bones in infancy (about 270 at birth) – As we grow our bones fuse together decreasing the number of bones in the body Cartilage • Location – External ear – Nose – Joints (articular) – Ribs (costal – attach ribs to sternum) – Larynx (and epiglottis) – Airways of resp. system – Intervertebral discs – Pubic symphysis Cartilage Structure • No nerves or blood vessels – doesn’t regenerate well • Perichondrium – Irregular (dense) CT, surrounds cartilage; helps with growth, repair, pressure resistance • 60-80% water (helps with compression) • Hyaline, elastic, fibrocartilage • READ box in p. 127 “A Closer Look” Cartilage Growth • Grows in two ways – Appositional: ”growth from outside” chondro blasts in perichondrium secrete matrix – Interstitial: “growth from within” chondro cytes divide and secrete matrix • Finished growing in teens • Calcified cartilage – Ca phosphate in matrix Bone • Bones are organs! • Functions – Support (framework) – Movement (with muscles, ligaments, tendons) – Protection (e.g., skull, vertebrae) – Mineral storage (Ca, P) – Blood cell formation and energy storage • Red marrow – blood cell production • Classification of Bones • Long – More long than wide – Shaft and two ends • Short – Cube-shaped, wrist and ankle – Sesamoid bone: forms within tendon (e.g., patella) • Flat – Thin, flat, and often curved (Cranium) • Irregular – Various shapes (e.g., vertebrae, hip bones) Gross Anatomy – Bones...
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Chapter_6 - KIN 216 Applied Human Anatomy Chapter 6 Slides...

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