Trunk and Root Nerves

Question 1

upper radicular syndrome

Answer 1

erb’s palsy or reb-duchenne

damage to C4-C6 - upper trunk of BP

weak elbow flex, shoulder abd, IR and ER, scapular motion

sensory loss on outer arm and forearm

absent biceps reflex

waiter’s tip

Question 2

middle radicular syndrome

Answer 2

C7 or middle trunk of BP

radial sx except brachioradialis

Question 3

lower radicular syndrome

Answer 3

klumpke palsy

lower trunk of BP - C8-T11

FCU, FD, interossei, thenar and hypothenar

simian hand - flattened hand d/t weak intrinsic

sensory loss on inner arm, forearm, ulnar hand

no triceps reflex and horner’s syndrome

Question 4

cord injury

Answer 4

lateral: musculocutaneous and lateran median

post: radial and axillary

medial: ulnar and medial median

Question 5

diffuse plexus injury

Answer 5

polyneuropathy or chronic inflammatory demyelinating neuropathy

sharp pain on shoulder that radiates to arm then weakness

affects long thoracic and ant interosseous

Question 6

TOS

Answer 6

compression of C8-T11 of BP or subclavian artery/vein sa ribs, fibrous bands or scalenese

nuerogenic: pain in shoulder, arm, hand and 4th-5th digits

vascular: compression of BV leading to ischemia

Question 7

lumbar plexus

Answer 7

L2-L4

femoral: pectineus, sartorius and quads; inguinal ligament

obturator: adductor and obturator ex; obturator canal or pelvic brim

Question 8

sacral plexus

Answer 8

L4-S2

sciatic or common fibular/tibial nerves