Nerve injuries

Question 1

Improper use of crutches, injury at humerus MIDSHAFT/spiral groove →

(Sleep palsy, Saturday night palsy)

Answer 1

Radial n. (C5-T1)

“Wrist drop”, weakness pushing away, difficulty opening hand/extending wrist

Question 2

Fracture of humerus SURGICAL NECK
Anterior shoulder dislocation (glenohumeral joint)
Heavy Backpack
Rotator cuff repair surgery →

Answer 2

Axillary n. (C5-C6)

Numb in posterior deltoid region, difficulty abducting arm, diminished lateral rotation of arm

Question 3

Wound to axillary region

Surgical removal of axillary lymph nodes →

Answer 3

LTN (long thoracic n.) (C5-C7)

Can’t raise arms above 90°, “winged scapula”

Question 4

Fracture of humerus medial epicondyle (press under it to feel it)

Entrapment of nerve in cubital tunnel →

Answer 4

Ulnar n. (C8, T1 and often C7)

Numbness/tingling in 4th/5th fingers, weak grip, loss of some finger flexion, loss of finger ab/adduction

Question 5

Humerus fracture above condyles, entrapment of n. by pronator teres, carpal tunnel syndrome →

Answer 5

Median n. (C6-T1)

“Hand of benediction”, “Ape hand-flat thenar eminence”, pain/tender in anterior-proximal

Question 6

Falling onto neck/shoulders and increasing angle

Bicep damage →

Answer 6

Superior trunk (C5-C6)

“Erb’s Palsy”, “waiter’s tip” position (elbow pronated, extended, arm internally rotated)

Question 7

Pulling arm too much (abduction of arm)

Hanging from tree, pulling baby out →

Answer 7

Inferior trunk (C8-T1)

“Klumpke’s Palsey”, “Claw hand-wrist extended” (ulnar n.)

Question 8

Dr. CUMAB

Answer 8

DR. CUMAB

DR= Drop wrist → Radial n. damage

CU=Claw hand → Ulnar n.

MAB= Median n. damage → Ape hand, Benediction hand

Question 9

Muscles of the Posterior Forearm are innervated by what nerve?

Answer 9

Radial n.

Question 10

Muscles of the Anterior Forearm are innervated by what nerve?

Answer 10

Median n.

except Flexor carpi ulnaris=Ulnar n.
Flexor digitorum profundus (Ulnar n. and 1/2 median n.)

Question 11

Muscles used to raise arm (in order)

Answer 11

Supraspinatus
Deltoid
Serratus anterior

Question 12

Radial n. innervates the “BEAST”

Answer 12

Radial n.

Brachioradialis
Extensors
Anconeus
Supinator
Triceps

AND….Abductor pollicis longus

Question 13

Musculocutaneous n. innervates the ANTERIOR COMPARTMENT

Answer 13

“BBC” (showing your muscles → flexor)

Brachialis
Biceps brachii
Coracobrachialis

Question 14

Axillary n. innervates what muscles?

Answer 14

Deltoid

Teres minor

Question 15

Teres major innervated by what nerve?

Answer 15

Lower subscapular (C5-C6)

Question 16

Subscapularis is innervated by what nerve?

Answer 16

Upper/lower subscapular