Upper Extremity Muscle Actions

Question 1

Shoulder Flexion

Answer 1

1. Anterior deltoid
2. Coracobrachialis
3. Pectoralis Major (clavicular head)
4. Biceps Brachii

Question 2

Shoulder extension

Answer 2

1. Latissimus dorsi
2. Posterior deltoid
3. Teres major
4. Triceps Brachii (long head)

Question 3

Shoulder abduction

Answer 3

1. Middle deltoid

2. Supraspinatus

Question 4

Shoulder adduction

Answer 4

1. Pectoralis Major
2. Latissimus dorsi
3. Teres major

Question 5

Shoulder External (lateral) rotation

Answer 5

1. Teres minor
2. Infraspinatus
3. Posterior Deltoid

Question 6

Shoulder Internal (medial) Rotation

Answer 6

1. Subscapularis
2. Teres major
3. Pectoralis major
4. Latissimus dorsi
5. Anterior Deltoid

Question 7

Shoulder horizontal abduction

Answer 7

1. Deltoid (posterior)
2. Infraspinatus
3. Teres minor

Question 8

Shoulder horizontal adduction

Answer 8

1. Deltoid (anterior)

2. Pectoralis major

Question 9

Scapula elevation

Answer 9

1. Upper trapezius

2. Levator scapulae

Question 10

Scapula depression

Answer 10

1. Latissimus dorsi
2. Pectoralis major
3. Pectoralis minor
4. Lower trapezius

Question 11

Scapula Protraction

Answer 11

1. Serratus Anterior

2. Pectoralis minor

Question 12

Scapula Retraction

Answer 12

1. Trapezius (middle)

2. Rhomboids

Question 13

Scapula upward rotation

Answer 13

1. Trapezius (upper, lower)

2. Serratus Anterior

Question 14

Scapula downward rotation

Answer 14

1. Rhomboids
2. Levator s scapulae
3. Pectoralis minor

Question 15

Elbow Flexion

Answer 15

1. Biceps Brachii
2. Brachialis
3. Brachoradialis

Question 16

Elbow extension

Answer 16

1. Triceps Brachii

2. Anconeus

Question 17

Forearm Supination

Answer 17

1. Biceps Brachii

2. Supinator

Question 18

Forearm Pronation

Answer 18

1. Pronator Teres

2. Pronator Quadratus

Question 19

Wrist Flexion

Answer 19

1. Flexor capri radials (FCR)
2. Flexor capri ulnaris (FCU)
3. Palmaris longus

Question 20

Wrist Extension

Answer 20

1. Extensor Carpis radialis longus (ECRL)
2. Extensor carpis radialis brevis (ECRB)
3. Extensor carpis ulnaris (ECU)

Question 21

Radial deviation

Answer 21

1. ECRL + ECRB
2. FCR
3. Extensor pollicis longus (EPL)
4. Extensor pollicis Brevis (EBL)

Question 22

Ulnar deviation

Answer 22

1. ECU

2. FCU