UE Nerves

Question 1

axillary nerve - branch of brachial plexus and nerve roots

Answer 1

posterior cord

C5 - C6

Question 2

axillary nerve - motor supply

Answer 2

teres minor + deltoid

Question 3

axillary nerve - sensory supply

Answer 3

lower half of deltoid and upper part of long head of triceps

Question 4

axillary nerve - injured due to:

Answer 4

• dislocation of shoulder
• fx of surgical neck of humerus

Question 5

axillary nerve - effects of injury

Answer 5

• “square shoulder” from deltoid muscle atrophy
• sensory loss over lower half of deltoid

Question 6

radial nerve - branch of brachial plexus + nerve roots

Answer 6

posterior cord

C5-8, T1

Question 7

radial nerve - motor supply

Answer 7

triceps, anconeus, brachioradialis, supinator, abductor pollicis longus, extensor muscles

Question 8

radial nerve - sensory supply

Answer 8

lower half of lateral side of arm; back of arm and forearm; lateral half of dorsal of hand; lateral two and half digits and thumb

Question 9

radial nerve - injury

Answer 9

radial tunnel syndrome (tenderness in ext muscle mass of forearm; pain w/ long finger ext); posterior interosseous nerve syndrome; wrist drop

Question 10

ulnar nerve - branch of brachial plexus and nerve root

Answer 10

medial cord

C7 - T1

Question 11

ulnar nerve - what it passes through to enter the hand

Answer 11

guyots canal/tunnel

Question 12

ulnar nerve - motor supply

Answer 12

dorsal and palmar interossei; adductor pollicis; opponens digiti minimi; flexor digiti minimi; abductor digiti minimi; flexor pollicis brevis; flexor digitorum profundus (median half); flexor carpi ulnaris; lumbricals 3-4

Question 13

ulnar nerve - sensory supply

Answer 13

• palmar branch = medial 1/2 of palm
• dorsal branch = dorsal aspect of medial one and half fingers
• superficial branch = 1/2 of 4-5 digiti

Question 14

ulnar nerve - injuries

Answer 14

• cubital tunnel syndrome (affected sensation, inability to grip paper)
• guyot’s canal syndrome (sensory changes and progressive weakness distal to site)
• ulnar claw hand (hyperext 4-5th MCP, flex 4-5 IP due to weakness of lumbricals and interossei)

Question 15

median nerve - branch of brachial plexus and nerve roots

Answer 15

medial and lateral cord

C5-8, T1

Question 16

median nerve - enters hand via:

Answer 16

carpal tunnel

Question 17

median nerve - motor supply

Answer 17

flexor digitorum profundus (radial half); flexor pollicis longus; pronator quadrates; abductor pollicis brevis; pronator teres; opponens pollicis; palmares longus; lumbricals 1-2; flexor carpi radialis; flexor digitorum superficialis; flexor pollicis brevis

Question 18

median nerve - sensory supply

Answer 18

lateral 2/3 of palm; dorsal tips of 1-3 fingers; palmar skin of lateral three and half fingers

Question 19

median nerve - injuries

Answer 19

• pronator teres syndrome (muscle normal, but others and sensory affected)
• carpal tunnel syndrome (compressed under flexor retinaculum)
• ape hand deformity (wasting of thenar eminence - median nerve palsy)

Question 20

msuculocutaneous nerve - branch of brachial plexus and nerve root

Answer 20

lateral cord

C5-7

Question 21

msuculocutaneous nerve - motor supply

Answer 21

biceps, brachial, coracobrachialis

Question 22

msuculocutaneous nerve - sensory supply

Answer 22

lateral cutaneous nerve of forearm = skin on lateral side of forearm

Question 23

suprascapular nerve - branch from brachial plexus and nerve roots

Answer 23

arise from upper trunk

C5-6

Question 24

suprascapular nerve - motor supply

Answer 24

infraspinatus; supraspinatus

Question 25

subscapular nerve - branch of brachial plexus and nerve roots

Answer 25

posterior cord C5-6

Question 26

subscapular nerve - motor supply

Answer 26

lower = teres major upper and lower = subscapularis

Question 27

lateral pectoral nerve - branch of brachial plexus and nerve roots

Answer 27

lateral cord C5-7

Question 28

lateral pectoral nerve - motor supply

Answer 28

pectoralis major

Question 29

medial pectoral nerve - branch of brachial plexus and nerve roots

Answer 29

medial cord C8- T1

Question 30

medial pectoral nerve - motor supply

Answer 30

pectoralis minor

Question 31

long thoracic nerve - branch of brachial plexus and nerve roots

Answer 31

arise from roots of brachial plexus C5-7

Question 32

long thoracic nerve - motor supply

Answer 32

serrates anterior (winged scapula)

Question 33

thoracodorsal nerve - branch of brachial plexus and nerve roots

Answer 33

posterior cord C6-8

Question 34

thoracodorsal nerve - motor supply

Answer 34

latissimus dorsi

Question 35

dorsal scapular nerve - branch of brachial plexus and nerve roots

Answer 35

arise from root of brachial plexus C5

Question 36

dorsal scapular nerve - motor supply

Answer 36

rhomboid major and minor, elevator scapulae

Question 37

nerve to subclavius - branch of brachial plexus and nerve roots

Answer 37

arise from upper trunk of brachial plexus 5-6

Question 38

nerve to subclavius - motor supply

Answer 38

subclavius

Question 39

spinal accessory nerve (CN 11) - motor supply

Answer 39

traps, sternocleidomastoid