// Please use this as a reference and compile your own answer with its help // Best regards // // Honest Abe // Compare and contrast the major muscle groups of the upper and lower limbs and relate their similarities and differences to their function. The upper and lower limbs muscles, also called appendicular muscles, help in total range of movement of these limbs. Upper limb involves the pectoral girdle and muscles of the arm whereas lower limb involves the pelvic girdle and muscles of leg. In the upper limb, pelvic girdle muscle mainly, pectoralis major is responsible for keeping the upper limb stable or close to torso (adduction), initiating movement by flexion of upper arm and internal rotation of arm. Likewise pelvic girdle muscles involved in lower limb are iliacus and psoas major. They stabilize the upper leg being connected to axial skeleton on other end and help in transferring of weight and initiating movement limb. Gluteus maximus muscle on the back helps in extending hip joint and external rotation of leg.
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