This document summarizes the major muscles of the upper and lower extremities. It describes the muscles of the arm, forearm, thigh, and leg, organized by anatomical compartment. For each region, it lists the superficial and deep muscle groups from lateral to medial and their main actions. The upper extremity sections cover the muscles of the arm's anterior, posterior, and lateral compartments and the forearm's anterior and posterior groups. The lower extremity sections discuss the thigh muscles that act on the femur and the anterior, posterior, and lateral muscle compartments of the leg and their actions on the ankle.

1. The Muscles of the Upper and Lower Extremities

2. The Muscles of the Upper Extremity

3. The arm

4. The Anterior Compartment

5. The Anterior Compartment of the Arm

6. The Superficial Muscles of the Arm (Anterior View)

7. The Deep Muscles of the Arm (Anterior View)

8. The Posterior Compartment

10. The Posterior and lateral compartments of the arm

12. The forearm

13. The anterior group

15. The superficial anterior group(Lateral to Medial)

16. The superficial anterior group Pronatorteres Flexor carpiradialis Plamarislongus Flexor carpiulnaris Flexor digitorumsuperficialis

17. The deep anterior group(lateral to medial)

18. The deep anterior group Flexor digitorumprofundus Flexor pollicislongus Pronatorquadratus

19. The posterior group

21. The superficial posterior group(lateral to medial)

22. The superficial posterior group Extensor carpiradialislongus Extensor carpiradialisbrevis Extensor digitorumcommunis Extensor digitiminimi Extensor carpiulnaris

23. The deep posterior group(lateral to medial)

24. The deep posterior group Supinator Abductor pollicislongus Extensor pollicisbrevis Extensor pollicislongus Extensor indicis

25. The muscles of the lower extremity

26. Muscles that act on the femur

27. Muscles that act on the femur

28. Muscles that act on the femur

30. Medial compartment of the thigh

34. Anterior compartment of the thigh

38. posterior compartment of the thigh

43. Summary of muscle actions on the hip (including the muscles of the thigh)

47. The leg

49. Anterior compartment of the leg

52. Lateral compartment of the leg

55. Posterior compartment of the leg

60. Summary of muscle actions on the ankle