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Biology 323 Human Anatomy for Biology Majors Lecture 9 Dr. Stuart S. Sumida

Biology 323 Human Anatomy for Biology Majors Lecture 9 Dr. Stuart S. Sumida. Pelvis and Perineum Human Walking. Overview of Pelvis and Perineum. Piriformis muscle Sacrospinous Ligament Sacrotuerous ligament. Piriformis muscle Sacrospinous Ligament Sacrotuerous Ligament

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Biology 323 Human Anatomy for Biology Majors Lecture 9 Dr. Stuart S. Sumida

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  1. Biology 323 Human Anatomy for Biology Majors Lecture 9 Dr. Stuart S. Sumida Pelvis and Perineum Human Walking

  2. Overview of Pelvis and Perineum

  3. Piriformis muscle Sacrospinous Ligament Sacrotuerous ligament

  4. Piriformis muscle Sacrospinous Ligament Sacrotuerous Ligament Obturator membrane

  5. Factors Affecting Locomotion:Walking

  6. Walking: Has a Double Support Phase Support Phase = when foot is on the ground.

  7. The leg is like an inverted pendulum when walking...

  8. Nine Factors Influencing Walking: 1. Pelvic Rotation 2. Pelvic Tilt 3. Lateral Displacement of Pelvis 4. Bending of the Knee 5. Lateral Flexion of Trunk 6. Antero-posterior Flexion of Trunk 7. Dorsiflexion of Foot 8. Plantarflexion of Foot 9. Compliance of Foot

  9. 1. Pelvic Rotation Lateral-medial axis of pelvis rotates about the center when walking.

  10. 2. Pelvic Tilt Hip tilts to compensate for the weight of the swing leg.

  11. 3. Lateral Displacement of Pelvis Hips move from side to side to keep center of mass over support limb.

  12. 4. Bending of the Knee Knee bends between heel-strike and pushoff.

  13. 5. Lateral Flexion of Trunk Trunk flexes laterally to help to keep center of mass over support limb.

  14. 6. Antero-posterior Flexion of Trunk Trunk flexes anteriorly and posteriorly to help keep center of mass over support limb.

  15. 7. Dorsiflexion of Foot • Foot flexes dorsally upon heel strike (with • locked knee). • Catches falling body.

  16. 8. Plantarflexion of Foot Plantarflexion of foot provides power for toeoff.

  17. 9. Compliance of Foot Flexibility of foot smooths oscillation at other joints.

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