CHAPTER 50

Question 1

pectoralis major muscle
group:
action:
innervation:

Answer 1

pectoral region
adduct, medially rotate and flex arm at shoulder
medial pectoral nerve
lateral pectoral nerve

Question 2

pectoralis minor muscle
group:
action:
innervation:

Answer 2

pectoral region
depress scapula
medial pectoral nerve

Question 3

serratus anterior muscle
group:
action:
innervation:

Answer 3

pectoral region
upward rotation of scapula
long thoracic nerve

Question 4

deltoid muscle
group:
action:
innervation:

Answer 4

shoulder
flex, extend, medially and laterally rotate, and abduct arm at shoulder
axillary nerve

Question 5

supraspinatus muscle
group:
action:
innervation:

Answer 5

shoulder
abduct arm at shoulder
suprascapular nerve

Question 6

infraspinatus muscle
group:
action:
innervation:

Answer 6

shoulder
lateral rotation of arm at shoulder
suprascapular nerve

Question 7

teres minor muscle
group:
action:
innervation:

Answer 7

shoulder
lateral rotation of arm at shoulder
axillary nerve

Question 8

subscapularis muscle
group:
action:
innervation:

Answer 8

shoulder
medial rotation of arm at shoulder
upper and lower subscapular nerves

Question 9

teres major muscle
group:
action:
innervation:

Answer 9

shoulder
adduct and medially rotate arm at shoulder
lower subscapular nerve

Question 10

triceps brachii muscle 
long head
lateral head 
medial head
group:
action:
innervation:

Answer 10

arm
extend forearm at elbow
radial nerve

Question 11

biceps brachii muscle 
long head
short head
group:
action:
innervation:

Answer 11

arm
flex and supinate forearm at elbow
musculocutaneous nerve

Question 12

coracobrachialis
group:
action:
innervation:

Answer 12

arm
flex arm at shoulder
musculocutaneous nerve

Question 13

brachialis muscle
group:
action:
innervation:

Answer 13

arm
flex forearm at elbow
musculocutaneous nerve

Question 14

pronator teres muscle
group:
action:
innervation:

Answer 14

anterior superficial forearm muscles
pronate forearm at elbow
median nerve

Question 15

flexor carpi radialis muscle
group:
action:
innervation:

Answer 15

anterior superficial forearm muscles
flex and abduct hand at wrist
median nerve

Question 16

palmaris longus muscle
group:
action:
innervation:

Answer 16

anterior superficial forearm muscles
flex hand at wrist
median nerve

Question 17

flexor carpi ulnaris muscle
group:
action:
innervation:

Answer 17

anterior superficial forearm muscles
flex and adduct hand at wrist
ulnar nerve

Question 18

flexor digitorum superficialis muscle
group:
action:
innervation:

Answer 18

anterior intermediate forearm muscles
flex digits 2-5
median nerve

Question 19

flexor pollicis longus muscle
group:
action:
innervation:

Answer 19

anterior deep forearm muscles
flex thumb
anterior interosseous nerve (AIN)

Question 20

flexor digitorum profundus muscle
group:
action:
innervation:

Answer 20

anterior deep forearm muscles
flex digits 2-5
AIN
ulnar nerve

Question 21

pronator quadratus muscle
group:
action:
innervation:

Answer 21

anterior deep forearm muscles
pronate hand at wrist
AIN

Question 22

brachioradialis muscle
group:
action:
innervation:

Answer 22

posterior superficial forearm muscles
flex forearm at elbow
radial nerve

Question 23

extensor carpi radialis longus muscle
group:
action:
innervation:

Answer 23

posterior superficial forearm muscles
extend and abduct hand at wrist
radial nerve

Question 24

extensor carpi radialis brevis muscle
group:
action:
innervation:

Answer 24

posterior superficial forearm muscles
extend and abduct hand at wrist
radial nerve

Question 25

extensor digitorum muscle group: action: innervation:

Answer 25

posterior superficial forearm muscles extend digits 2-5 posterior interosseous nerve (PIN)

Question 26

extensor digiti minimi muscle group: action: innervation:

Answer 26

posterior superficial forearm muscles extend digit 5 PIN

Question 27

extensor carpi ulnaris muscle group: action: innervation:

Answer 27

posterior superficial forearm muscles extend and abduct hand at wrist PIN

Question 28

anconeus muscle group: action: innervation:

Answer 28

posterior superficial forearm muscles extend forearm at elbow radial nerve

Question 29

supinator muscle group: action: innervation:

Answer 29

posterior deep forearm muscles supinate forearm at elbow PIN

Question 30

abductor pollicis longus muscle group: action: innervation:

Answer 30

posterior deep forearm muscles abduct thumb PIN

Question 31

extensor pollicis brevis muscle group: action: innervation:

Answer 31

posterior deep forearm muscles extend thumb PIN

Question 32

extensor pollicis longus muscle group: action: innervation:

Answer 32

posterior deep forearm muscles extend thumb PIN

Question 33

extensor indicis muscle group: action: innervation:

Answer 33

posterior deep forearm muscles extend index finger PIN

Question 34

abductor pollicis brevis muscle group: action: innervation:

Answer 34

hand- thenar muscles abduct thumb recurrent branch of median nerve

Question 35

flexor pollicis brevis muscle group: action: innervation:

Answer 35

hand- thenar muscles flex thumb recurrent branch of median nerve deep branch of ulnar nerve

Question 36

opponens pollicis muscle group: action: innervation:

Answer 36

hand- thenar muscles oppose thumb recurrent brach of median nerve

Question 37

adductor pollicis muscle group: action: innervation:

Answer 37

hand- thenar muscles adduct thumb deep branch of ulnar nerve

Question 38

abductor digiti minimi muscle group: action: innervation:

Answer 38

hand- hypothenar muscles abduct digit 5 deep branch of ulnar nerve

Question 39

flexor digiti minimi brevis muscle group: action: innervation:

Answer 39

hand- hypothenar muscles flex digit 5 deep branch of ulnar nerve

Question 40

opponens digiti minimi group: action: innervation:

Answer 40

hand- hypothenar muscles oppose digit 5 deep branch of ulnar nerve

Question 41

palmaris brevis muscle group: action: innervation:

Answer 41

hand- hypothenar muscles pull skin superficial branch of ulnar nerve

Question 42

lumbricals 1-4 group: action: innervation:

Answer 42

hand- small hand muscles move digits (Z position) lumbricals 1, 2: median nerve lumbricals 3, 4: deep branch of ulnar nerve

Question 43

dorsal interossei 1-4 group: action: innervation:

Answer 43

hand- small hand muscles abducts digits (Z position) deep branch of ulnar nerve

Question 44

palmar interossei 1-4 group: action: innervation:

Answer 44

hand- small hand muscles adducts digits (Z position) deep branch of ulnar nerve