Iliopsoas (Psoas major & Iliacus)

1. Iliopsoas (Psoas major & Iliacus) • Action • flexion at hip • flexion at lumbar intervertebral joints (psoas major only)

2. Gluteus Maximus • Largest • Actions • Extends and laterally rotates at hip joint

3. Gluteus Medius • 2nd Largest • Actions • Abduction and medial rotation at hip joint

4. Gluteus Minimus • Smallest • Actions • abducts and medially rotates • SAME AS MEDIUS

5. Tensor Fasciae Latae (iliotibial or IT band) • Action • flexion and medial rotation at hip • lateral support of knee

6. Piriformis • Origin • sacrum • Insertion • femur (greater Trochanter) • Action • lateral rotation and abduction at hip joint

7. Quadratus Femoris • Action • lateral rotation at the hip joint

8. Adductor Magnus • Origin • pubis & ischium • Insertion • femur (linea aspera) • Action • altogether: adduction at hip joint • superior portion: flexion and medial rotation at hip • inferior part: extension and lateral rotation at hip

9. Adductor Longus • Origin • pubis • Insertion • femur (linea aspera) • Action • adduction, flexion, and medial rotation at hip • same for adductor brevis

10. Adductor Brevis • Origin • pubis • Insertion • femur (linea aspera) • Action • adduction, flexion, and medial rotation at hip • same for adductor longus

11. Pectineus • Origin • Pubis • Insertion • Femur • Action • adducts, flexes, and medially rotates at hip

12. Gracilis • Origin • pubis • Insertion • tibia • Action • flexes at knee, adducts and medially rotates at hip

13. Rectus Femoris • Origin • anterior inferior iliac spine • Insertion • tibial tuberosity via patellar ligament • Action • extends at knee, flexes at hip • part of quadriceps femoris muscle group of anterior thigh

14. Vastus Lateralis • Origin • femur • Insertion • tibial tuberosity via patellar ligament • Action • extension at knee joint • part of quadriceps femoris muscle group of anterior thigh

15. Vastus Medialis • Origin • Femur • Insertion • tibial tuberosity via patellar ligament • Action • extension at knee joint • part of quadriceps femoris muscle group of anterior thigh

16. Vastus Intermedius • Origin • femur • Insertion • tibial tuberosity via patellar ligament • Action • extension at knee joint • part of quadriceps femoris muscle group of anterior thigh

17. Sartorius • Origin • Anterior superior iliac spine • Insertion • tibia • Action • flexion at knee • flexion and lateral rotation at hip

18. Biceps Femoris • Origins • Long Head: ischial tuberosity • Short Head: femur • Insertion • Long Head: tibia • Short Head: head of fibula • Action • flexes knee, extends and laterally rotates hip • Part of Hamstring Muscle group (posterior thigh)

19. Semimembranosus • Origin • ischial tuberosity • Insertion • medial tibia • Action • flexion at knee, extension and medial rotation at hip • Part of Hamstring Muscle group (posterior thigh)

20. Semitendinosus • Origin • Ischial Tuberosity • Insertion • medial tibia • Action • flexion at knee, extension and medial rotation at hip • Part of Hamstring Muscle group (posterior thigh)

21. Tibialis Anterior • Action • dorsiflexion (flexion at ankle) • inversion of foot

22. Peroneals • peroneus (fibularis) longus • peroneus (fibularis) brevis • Actions • eversion of foot and plantar flexion (extension at ankle)

23. Gastrocnemius • Origin • femur • Insertion • calcaneus via achille’s tendon • Action • plantar flexion (extension at ankle), inversion of foot, flexion of knee

24. Soleus • Origin • fibula & tibia • Insertion • calcaneus via achille’s tendon • Action • plantar flexion (extension of ankle)

25. Popliteus • Action • medial rotation of tibia (or lateral rotation of femur) • flexion at knee

26. Extensor Digitorum Longus • Action • flexion at joints of toes 2-5

27. Extensor Hallucis Longus • Action • Flexion at great toe