Upper Extremity Muscle Actions

Question 1

flexor carpi radialis

Answer 1

flexes and ABducts hand at wrist

Question 2

flexor carpi ulnaris

Answer 2

flexes and ADducts hand at wrist

Question 3

flexor digitorum profundus

Answer 3

flexes distal phalanges of medial 4 digits; assists with flexion of hand at wrist

Question 4

flexor digitorum superficialis

Answer 4

flexes middle and proximal phalanges of medial 4 digits; flexes hand at wrist

Question 5

flexor pollicis longus

Answer 5

flexes phalanges of thumb

Question 6

palmaris longus

Answer 6

flexes hand at wrist and tenses palmar aponeurosis

Question 7

pronator quadratus

Answer 7

pronates forearm

Question 8

pronator teres

Answer 8

pronates forearm and assists with elbow flexion

Question 9

anconeus

Answer 9

assists triceps in extending elbow; ABducts ulna in pronation

Question 10

biceps brachii

Answer 10

flexes and supinates forearm at elbow

Question 11

brachialis

Answer 11

flexes forearm at elbow

Question 12

coracobrachialis

Answer 12

flexes and ADducts arm at shoulder

Question 13

triceps brachii

Answer 13

extends forearm at elbow; long head extends and adducts arm at shoulder

Question 14

abductor digiti minimi

Answer 14

abducts pinky

Question 15

abductor pollicis brevis

Answer 15

abducts thumb

Question 16

adductor pollicis

Answer 16

adducts thumb

Question 17

dorsal interossei (DABS)

Answer 17

ABduct digits from axial line of hand (3rd digit); flexes digits at MCP joints; extend IP joints

Question 18

palmar interossei (PAD)

Answer 18

ADduct digits toward axial line of hand (3rd digit); flex digits at MCP joints; extend IP joints

Question 19

flexor digiti minimi brevis

Answer 19

flex proximal phalanx of pinky

Question 20

flexor pollicis brevis

Answer 20

flexes proximal phalanx of thumb

Question 21

lumbricals

Answer 21

extend digits at IP joints; flex MCP joints

Question 22

opponens digiti minimi

Answer 22

draws 5th metacarpal anteriorly and rotates it to face thumb

Question 23

opponens pollicis

Answer 23

draws 1st metacarpal anteriorly and rotates it medially

Question 24

palmaris brevis

Answer 24

tightens palmar aponeurosis; assists grip

Question 25

abductor pollicis longus

Answer 25

abducts and extends thumb at CMC joint

Question 26

brachioradialis

Answer 26

weak flexion of forearm

Question 27

extensor carpi radialis brevis

Answer 27

extends and ABducts hand at wrist

Question 28

extensor carpi radialis longus

Answer 28

extends and ABducts hand at wrist

Question 29

extensor carpi ulnaris

Answer 29

extends and ADducts hand at wrist

Question 30

extensor digiti minimi

Answer 30

extends 5th digit

Question 31

extensor digitorum

Answer 31

extends medial 4 digits; assists in wrist extension

Question 32

extensor indicis

Answer 32

extends 2nd digit; assits in wrist extension

Question 33

extensor pollicis brevis

Answer 33

extends proximal phalanx of thumb at CMC joint

Question 34

extensor pollicis longus

Answer 34

extends distal phalanx of thumb at IP and MCP joints

Question 35

supinator

Answer 35

supinates forearm