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Muscles of the Knee

Muscles of the Knee. Sartorius. Origin: anterior superior iliac spine (ASIS) Insertion: anterior medial surface of tibia (via pes anserinus) Innervation: femoral nerve (L2,3). Sartorius. Sartorius. Sartorius. Sartorius. Actions: Hip flexion Abduction External rotation of hip

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Muscles of the Knee

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  1. Muscles of the Knee

  2. Sartorius • Origin: • anterior superior iliac spine (ASIS) • Insertion: • anterior medial surface of tibia (via pes anserinus) • Innervation: • femoral nerve (L2,3)

  3. Sartorius

  4. Sartorius

  5. Sartorius

  6. Sartorius • Actions: • Hip flexion • Abduction • External rotation of hip • Knee flexion • Internal rotation of knee

  7. Quadriceps Femoris Group

  8. Rectus Femoris • Origin: • anterior inferior iliac spine, upper rim of acetabulum • Insertion: • tibial tuberosity (via patellar tendon) • Innervation: • femoral nerve (L2-4)

  9. Rectus Femoris

  10. Rectus Femoris

  11. Rectus Femoris

  12. Rectus Femoris

  13. Rectus Femoris • Actions: • Knee extension • Hip flexion

  14. Vastus Medialis • Origin: • medial lip of linea aspera • Insertion: • tibial tuberosity (via patellar tendon) • Innervation: • femoral nerve (L2-4)

  15. Vastus Medialis

  16. Vastus Medialis

  17. Vastus Medialis

  18. Vastus Lateralis • Origin: • greater trochanter, lateral lip of linea aspera, and gluteal tuberosity • Insertion: • tibial tuberosity (via patellar tendon) • Innervation: • femoral nerve (L2-4)

  19. Vastus Lateralis

  20. Vastus Lateralis

  21. Vastus Lateralis

  22. Vastus Intermedius • Origin: • upper 2/3 of anterior and lateral surface of femur • Insertion: • tibial tuberosity (via patellar tendon) • Innervation: • femoral nerve (L2-4)

  23. Vastus Intermedius

  24. Vasti Group • Action: • Knee extension

  25. Gracilis • Origin: • symphysis pubic and inferior pubic ramus • Insertion: • anterior medial surface tibia (via pes anserinus) • Innervation: • obturator nerve ( L2,3)

  26. Gracilis

  27. Gracilis

  28. Gracilis

  29. Gracilis • Actions: • Hip adduction • Internal rotation of hip • Knee flexion • Internal rotation of knee

  30. Hamstrings

  31. Biceps Femoris • Origin: • long head: ischial tuberosity short head: lateral lip of linea aspera • Insertion: • head of fibula, lateral condyle tibia • Innervation: • long head: tibial nerve short head • peroneal nerve (L5)

  32. Biceps Femoris (short head)

  33. Biceps Femoris (short head)

  34. Biceps Femoris (long head)

  35. Biceps Femoris (long head)

  36. Biceps Femoris

  37. Biceps Femoris tendon

  38. Biceps Femoris • Actions: • Hip extension • External rotation of knee • Knee flexion

  39. Semitendinosus • Origin: • lower, medial surface of ischial tuberosity (common tendon with biceps femoris) • Insertion: • anterior medial surface of tibia (via pes anserinus) • Innervation: • tibial nerve (L5)

  40. Semitendinosus

  41. Semitendinosus

  42. Semitendinosus

  43. Semitendinosus

  44. Semitendinosus

  45. Semitendinosus • Actions: • Internal rotation of knee • Hip extension • Knee flexion

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