Upper extremity muscles

Question 1

Pectoralis minor

Answer 1

Actions: protracts and depresses shoulder

Question 2

Serratus anterior

Answer 2

Actions: protraction, superior rotations, and stabilization of scapula

Question 3

Subclavius

Answer 3

Actions: depresses and stabilizes scapula

Question 4

Levator scapulae

Answer 4

Actions: elevates and inferiorly rotates scapula

Question 5

Rhomboid major

Answer 5

Actions: elevates, retracts and inferiorly rotates scapula

Question 6

Rhomboid minor

Answer 6

Actions: elevates, retracts and inferiorly rotates scapula

Question 7

Trapezius

Answer 7

Actions:
Superior fibers - elevates and superiorly rotates scapula
Inferior fibers - depress scapula

Question 8

Latissimus dorsi

Answer 8

Actions: extends, adducts and medially rotates arm

Question 9

Pectoralis major

Answer 9

Actions: flexes, adducts and medially rotates arm

Question 10

Deltoid

Answer 10

Actions:
Anterior fibers - flexes and medially rotates arm
Middle fibers - abducts arm
Posterior fibers - extends and laterally rotates arm

Question 11

Coracobrachialis

Answer 11

Actions: adducts and flexes arm

Question 12

Triceps brachii (long head)

Answer 12

Actions: extends and adducts arm

Proximal attachment: infraglenoid tubercle of scapula
Distal attachment: Olecranon of ulna

Question 13

Biceps brachii (long head)

Answer 13

Actions: flexes arm

Proximal attachment: supraglenoid tubercle of scapula
Distal attachment: radial tuberosity

Question 14

Rotator cuff muscles (SITS)

Answer 14

Actions collectively: stabilize glenohumeral joint

Question 15

Subscapularis

Answer 15

Actions: medially rotates arm

Proximal attachment: subscapular fossa of scapula
Distal attachment: lesser tubercle of humerus

Question 16

Supraspinatus

Answer 16

Actions: abducts arm

Proximal attachment: supraspinous fossa of scapula
Distal attachment: greater tubercle of humerus

Question 17

Infraspinatus

Answer 17

Actions: adducts and laterally rotates arm

Proximal attachment: infraspinous fossa of scapula
Distal attachment: greater tubercle of humerus

Question 18

Teres minor

Answer 18

Actions: adducts and laterally rotates arm

Proximal attachment: upper dorsal lateral border of scapula
Distal attachment: greater tubercle of humerus

Question 19

Biceps brachii (short head)

Answer 19

Actions: flexes and supinates arm

Proximal attachment: coracoid process
Distal attachment: radial tuberosity

Question 20

Brachialis

Answer 20

Actions: flexes forearm

Question 21

Brachioradialis

Answer 21

Actions: flexes forearm

Question 22

Triceps brachii (lateral head)

Answer 22

Actions: extends arm

Proximal attachment: posterior humerus above radial groove
Distal attachment: olecranon of ulna

Question 23

Triceps brachii (medial head)

Answer 23

Actions: extends arm

Proximal attachments: posterior humerus below radial groove
Distal attachment: olecranon of ulna

Question 24

Anconeus

Answer 24

Actions: extends forearm

Question 25

Pronator quadratus

Answer 25

Actions: pronates forearm

Question 26

Pronator teres

Answer 26

Actions: pronates forearm

Question 27

Supinator

Answer 27

Actions: supinates forearm

Question 28

Flexor carpi radialis

Answer 28

Actions: flexes wrist and abducts hand

Question 29

Palmaris longus

Answer 29

Actions: flexes wrist (weak)

Question 30

Flexor carpi ulnaris

Answer 30

Actions: flexes wrist and adduct hand

Question 31

Flexor digitorum superficialis

Answer 31

Actions: flexes wrist, 2nd-5th MP joints, PIP joints

Question 32

Flexor pollicis longus

Answer 32

Actions: flexes MP joint of thumb, IP joint of thumb, flexes wrist (weak)

Question 33

Flexor digitorum profundus

Answer 33

Actions: flexes wrist, 2nd-5th MP joints, PIP joints, DIP joints

Question 34

Extensor carpi radialis longus

Answer 34

Actions: extends wrist, abducts hand

Question 35

Extensor carpi radialis brevis

Answer 35

Actions: extends wrist, abducts hand

Question 36

Extensor digitorum

Answer 36

Actions: extends wrist, extends 2nd-5th MP joints, PIP joints, and DIP joints

Question 37

Extensor digiti minimi

Answer 37

Actions: extends wrist, MP, and PIP joints of 5th digit

Question 38

Extensor carpi ulnaris

Answer 38

Actions: extends wrist, adducts hand

Question 39

Abductor pollicis longus

Answer 39

Actions: abducts thumb, extends wrist (weak)

Question 40

Extensor pollicis brevis

Answer 40

Actions: extends MP joints of thumb, extends wrist (weak)

Question 41

Extensor pollicis longus

Answer 41

Actions: extends MP and IP joints of thumb, extends wrist (weak)

Question 42

Extensor indicis

Answer 42

Actions: extends MP, PIP, DIP joints of finger 2, extends wrist (weak)

Question 43

Flexor pollicis brevis

Answer 43

Actions: flexes thumb

Question 44

Abductor pollicis brevis

Answer 44

Actions: abducts thumb

Question 45

Opponens pollicis

Answer 45

Actions: Opposition of thumb

Question 46

Adductor pollicis

Answer 46

Actions: adducts thumb

Question 47

Flexor digiti minimi brevis

Answer 47

Actions: flexes 5th digit

Question 48

Abductor digiti minimi

Answer 48

Actions: abducts 5th digit

Question 49

Opponens digiti minimi

Answer 49

Opposition of 5th digit