MSK - Brachial Plexus Especially

Question 1

Upper Trunk

Answer 1

C5 C6

Question 2

Middle Trunk

Answer 2

C7

Question 3

Lower Trunk

Answer 3

C8, T1

Question 4

Anterior Division

Answer 4

C5, C7, T1

Question 5

Posterior Division

Answer 5

C6, C7, C8

Question 6

Lateral Cord

Answer 6

musculocutaneous nerve

lateral root of median nerve

Question 7

medial cord

Answer 7

medial root of medial nerve

ulnar nerve

Question 8

posterior cord

Answer 8

axillary nerve

radial nerve

Question 9

musculocutaneous nerve

Answer 9

C5,6,7

flexors

Question 10

median nerve

Answer 10

flexors

C6,7,C8,T1

Question 11

ulnar nerve

Answer 11

C8, T1

skin and forearm of hand

Question 12

axillary nerve

Answer 12

C5,6
deltoid, teres minor
extensors

Question 13

radial nerve

Answer 13

C5-8, T1
triceps
extensors

Question 14

deltoid

Answer 14

arm abduction

axillary nerve

Question 15

wrist drop

Answer 15

radial nerve

Question 16

Erb Duchenne palsy/waiter’s tip

Answer 16

upper trunk (C5,6)
infants during delivery
pronated forearm

Question 17

Klumpke’s palsy

Answer 17

inferior trunk (C8,T1)
atrophy of thenar and hypothenar muscles

Question 18

ulnar claw

Answer 18

can’t extend 4th and 5th digits

Question 19

median claw

Answer 19

can’t extend 2nd and 3rd digits

Question 20

cutaneous innervation - palmar side

Answer 20

ulnar, median

very small amount of radial

Question 21

cutaneous innervation - dorsal side

Answer 21

radial (thumb and and lower 2nd and 3rd fingers)
median - upper 2nd and third fingers
ulnar - the rest

Question 22

cremaster muscle

Answer 22

part of internal oblique

pulls in testes when cold

Question 23

tennis elbow muscle

Answer 23

extensor carpi radialis brevis

Question 24

medially rotate arm

Answer 24

subscapularis

Question 25

recurrent laryngeal nerve is branch of

Answer 25

vagus

Question 26

muscles that vagus innervates

Answer 26

palatoglossus

Question 27

palatoglossus innervation

Answer 27

vagus

Question 28

spiral fracture

Answer 28

child abuse

Question 29

most commonly injured muscle of rotator cuff

Answer 29

supraspinatus

Question 30

rotator cuff

Answer 30

supraspinatus infraspinatus teres minor subscapularis

Question 31

opponens pollicis

Answer 31

innervated by median nerve

Question 32

laterally rotate arm

Answer 32

infraspinatus

Question 33

dORSAL INTEROSSEOUS MUSCLES

Answer 33

ABDUCT

Question 34

palmar interosseous muscles

Answer 34

adduct