Muscle Actions

Question 1

Pectoralis Major

Answer 1

· Horizontal adduction

· Medial rotation

· Shoulder adduction

Question 2

Serratus Anterior

Answer 2

· Scapular upward rotation

· Scapular abduction

· * Stabilizes the scapula

Question 3

Triceps Brachii

Answer 3

· Elbow extension (Extension of the forearm at the elbow.)

· The long head that originates from the scapula also helps in the extension of the shoulder.

Question 4

Gluteus Maximus

Answer 4

· Hip extension

· Hip external rotation

· Back extension at the hip joint (fixated thigh)

· Pelvis backward rotation (fixated thigh and back)

· The lateral fibers assists in hip abduction

· The medial fibers assists in hip adduction

Question 5

Gluteus Medius

Answer 5

· Actions:

· Hip abduction

Question 6

Rectus femoris

Answer 6

· Rectus femoris action:

· Knee extension

· Hip flexion

· Pelvis forward rotation (With the thigh fixed)

Question 7

Psoas

Answer 7

· Hip flexion

· Flexing the trunk on the femur (fixed thigh)

· Increase lordosis

· Lateral flexion of the trunk (unilateral movement)

· Assists in hip lateral rotation

Question 8

Biceps Brachii

Answer 8

· Elbow flexion

· Wrist supination

Question 9

Brachioradialis

Answer 9

· Elbow flexion (in midposition)

Question 10

Brachialis

Answer 10

· Elbow flexion