Upper Extremity - Action

Question 0

What is the action of the latissimus dorsi muscle?

Answer 0

Extensor, adductor and medial rotator of the arm

Question 1

What is the action of the trapezius muscle?

Answer 1

Upper and lower fibers - abduction of the arm

Upper fibers - elevate shoulder; brace for weight-bearing

Central fibers - retract shoulder

Lower fibers - depresses scapula

Both muscles - adduction of arm

Question 2

What is the action of the deltoid?

Answer 2

Principal - abduction of arm

Anterior fibers - flexor and medial rotator

Posterior fibers - extensor and lateral rotator

Question 3

What is the action of the supraspinatus?

Answer 3

Abduction and lateral rotation of the arm

Question 4

What is the action of the infraspinatus?

Answer 4

Lateral rotator of the arm

Question 5

What is the action of the teres minor?

Answer 5

Lateral rotator and weak adductor of the arm

Question 6

What is the action of the teres major?

Answer 6

Extensor, adductor and medial rotator of the arm

Question 7

What is the action of the subscapularis?

Answer 7

Medial rotator and adductor of the arm

Question 8

What is the action of the pectorals major?

Answer 8

Adductor, flexor and medial rotator of the arm

Question 9

What is the action of the biceps brachii?

Answer 9

Supinator; flexor (when supinated)

Question 10

What is the action of the coracobrachialis?

Answer 10

Flexor and adductor of the arm

Question 11

What is the action of the brachialis?

Answer 11

Flexor of the forearm

Question 12

What is the action of the triceps brachii?

Answer 12

Extensor of the forearm

Long head - extensor of the arm

Question 13

What is the action of the anconeus?

Answer 13

Extensor of the forearm; abductor of the ulna (pronated)

Question 14

What is the action of the pronator teres?

Answer 14

Flexor and rotator of the forearm

Question 15

What is the action of the pronator quadratus?

Answer 15

Pronator of the forearm

Question 16

What is the action of the flexor carpi radialis?

Answer 16

Flexor of the hand; abductor of the wrist

Question 17

What is the action of the palmaris longus?

Answer 17

Flexor of the hand; tightens palmar aponeurosis

Question 18

What is the action of the flexor carpi ulnaris?

Answer 18

Flexor and adductor of the hand

Question 19

What is the action of the flexor digitoxin superficialis?

Answer 19

Flexor at the PIPs, MCPs and wrist joints

Question 20

What is the action of the flexor digitorum profundus?

Answer 20

Primary - flexor of the DIPs

Question 21

What is the function of the flexor pollicis longus?

Answer 21

Primary - flexor of the distal phalanx of thumb

Question 22

What is the action of the supinator?

Answer 22

Supinator of the arm

Question 23

What is the function of the brachioradialis?

Answer 23

Accessory flexor of the forearm

Question 24

What is the action of the extensor carpi radialis longus?

Answer 24

Extensor and abductor of the hand

Question 25

What is the action of the extensor carpi radialis brevis?

Answer 25

Extensor and abductor of the hand

Question 26

What is the action of the extensor digitorum?

Answer 26

Extension of digits at the IP and MCP joints and wrist

Question 27

What is the action of the extensor digiti minimi?

Answer 27

Extensor of the 5th digit at the IP and MCP joints and wrist

Question 28

What is the action of the extensor carpi ulnaris?

Answer 28

Extensor and adductor of the hand

Question 29

What is the action of the abductor pollicis longus?

Answer 29

Abductor, extensor and lateral rotator of the thumb

Question 30

What is the action of the extensor pollicis brevis?

Answer 30

Extensor of the PP of thumb at MCP and metacarpal at CMC joint

Question 31

What is the action of the extensor pollicis longus?

Answer 31

Extensor of the thumb at the MCP and IP joints; abductor of the thumb

Question 32

What is the action of the extensor indicis?

Answer 32

Extensor of the 2nd digit

Question 33

What is the action of the abductor pollicis brevis?

Answer 33

Abductor of the CMC and MCP joints of the thumb

Question 34

What is the action of the flexor pollicis brevis?

Answer 34

Flexor of the thumb at the MCP joint; medial rotator of the 1st metacarpal

Question 35

What is the action of the opponent pollicis?

Answer 35

Medial rotator of the 1st metacarpal

Question 36

What is the action of the adductor pollicis?

Answer 36

Adductor of the proximal phalanx of thumb towards middle digit

Question 37

What is the action of the abductor digiti minimi?

Answer 37

Abduction of the 5th digit

Question 38

What is the action of the flexor digiti minimi brevis?

Answer 38

Flexor of the proximal phalanx of 5th digit at MCP joint

Question 39

What is the action of the opponents digiti minimi?

Answer 39

Abductor, flexor and lateral rotator of 5th metacarpal

Question 40

What is the action of the lumbricals?

Answer 40

Flexor at the MCP joint; extensor at the IP joints

Question 41

What is the action of the dorsal interposed muscles?

Answer 41

Abductor of the fingers; extensor of distal phalanges; flexor at the MCP joint

Question 42

What is the action of the palmar interossei?

Answer 42

Adductor of the fingers; flexor at the MCP; extensor of the distal phalanges