1. Seung Yeol Lee, M.D. Department of Orthopaedic Surgery, Seoul National University Bundang Hospital

3. Origin : T12-L5 vertebra Insertion : lesser trochanter Action : powerful hip flexion

4. Origin : T12 & L1 vertebra Insertion : pectineal line Action : weak flexion of trunk

5. Origin : iliac fossa Insertion : lesser trochanter Action : powerful hip flexion

8. Origin : ilium & dorsal sacrum Insertion 1. gluteal tuberosity 2. iliotibial band Action 1. powerful extension 2. ER of hip

9. Origin:ilium between anterior & posterior gluteal lines Insertion: greater trochanter Action: 1. powerful abduction 2. IR of hip 3. Balancing during walking

10. Origin: ilium between anterior & inferior gluteal lines Insertion: anterior greater trochanter Action: 1. abduction & IR of hip 2. Assist gluteus medius during walking

12. Origin: anterior sacrum Insertion: superior greater trochanter Action: 1. hip ER 2. hip abduction during flexion

14. Origin 1. ischiopubic rami 2.obturator membrane Insertion: medial greater trochanter Action: 1. hip ER 2. hip abduction during flexion

15. Origin: ischial spine(sup.) ischial tuberosity(inf.) Insertion: medial greater trochanter Action: 1. hip ER 2. hip abduction during flexion

16. Origin: ischial tuberosity Insertion: intertrochanteric crest Action: hip ER

19. Origin: ischial tuberosity Insertion: head of fibula Action: 1. hip extension 2. knee flexion & ER

20. Origin: 1. linea aspera, 2. supracondylar line Insertion: fibula, lateral tibia Action: knee flexion & ER

21. Origin: ischial tuberosity Insertion: proximal medial tibia Action: 1. hip extension 2. knee flexion & IR

22. Origin: ischial tuberosity Insertion: posterior medial tibial condyle Action: 1. hip extension 2. knee flexion & IR

24. Origin : 1. AIIS 2. superior rim of acetabulum Insertion : patella, tibial tubercle Action : 1. hip flexion 2. knee extension

26. Origin : Lateral and medial femoral condyle Insertion : Calcaneus ( via Achilles tendon) Action : Knee flexion, ankle plantar flexion

27. Origin : 1. Posterior fibula head 2. Soleal line of tibia Insertion : Calcaneus ( via Achilles tendon) Action : ankle plantar flexion

28. Origin : 1. Posterior fibula head 2. Soleal line of tibia Insertion : Calcaneus ( via Achilles tendon) Action : ankle plantar flexion

30. Origin : 1.Upper 2/3 of lat. Surface of tibia 2.Crural interosseous membrane 3.Highest part of Superficial crural fascia Insertion : 1.Medial and plantar surface of medial cuneiform 2.Medial base of metatarsal Action : Ankle dorsiflexion Inversion

31. Origin : 1.Head of fibula 2.Proximal 2/3 of lateral surface of fibula Insertion : 1.Plantar side of medial cuneiform 2.Base of first metatarsal Action : Ankle plantar flexion Eversion

33. Origin : 1.Crural interosseous membrane and adjacent borders of tibia and fibula Insertion : 1.Tuberosity of navicular, cuneiforms, base of second fourth metatarsals Action : Ankle plantar flexion Inversion

34. Origin : 1.Distal 2/3 of posterior surface of fibula Insertion : 1.Base of distal phalanx of big toe Action : Plantar flexion Inversion

35. Origin : 1.Middle third of posterior surface of tibia Insertion : 1.Base of second through fifth distal phalanges Action : Plantar flexion Inversion