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Intro to the Skeletal System

Intro to the Skeletal System. #1. Function: supports the body’s axis (trunk) Parts: Skull Vertebral column Rib cage. #2. Function: supports the appendages (limbs) Parts: Forelimbs (humerus, radius, ulna) Hind limbs (femur, tibia, fibula) Shoulder girdle Pelvic girdle. #3.

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Intro to the Skeletal System

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  1. Intro to the Skeletal System

  2. #1 • Function: supports the body’s axis (trunk) • Parts: • Skull • Vertebral column • Rib cage

  3. #2 • Function: supports the appendages (limbs) • Parts: • Forelimbs (humerus, radius, ulna) • Hind limbs (femur, tibia, fibula) • Shoulder girdle • Pelvic girdle

  4. #3 • Skull – balanced on vertebral column (baboon – attached to leading edge of vertebral column) • Vertebral column – S-shaped (baboon – arched horizontally) • Pelvic girdle – shorter, rounder, more vertical • Hand – strong grip, precision • Foot – support weight, walking & running

  5. Article: The Downside of Upright • Dangerous childbirth • Wide, flat, saddle-shaped pelvis • Back problems – esp. lumbar region • S-shaped vertebral column • Knee injuries • Increased lateral pressure • Foot problems • Arch

  6. #4 • Ball-and-socket (mvmt on several planes) • Humerus to shoulder girdle • Femur to pelvic girdle • Hinge (mvmt on one plane) • Humerus to ulna • Femur to tibia • Pivot (rotation) • Radius to ulna

  7. #5 • Yellow marrow • Located in central cavity • Stores fat • Red marrow • Located in spongy bone inside heads of bones • Produces blood cells

  8. #6 • Support • Upright posture, soft tissues • Protection • Skull, rib cage, pelvis • Movement • Muscle attachment, flexibility, leverage • Blood formation • Red bone marrow • Mineral storage • Calcium carbonate, calcium phosphate

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