UE Mononeuropathy

Question 1

Nerve root origin of radial nerve

Answer 1

C5-T1

Question 2

What 4 muscles does the radial nerve innervate before it splits at the elbow?

Answer 2

Triceps, ECRL, anconceus, brachioradialis

Question 3

What 2 branches does the radial nerve split into at the lateral epicondyle?

Answer 3

Posterior interosseous nerve (motor) and superficial radial nerve (sensory)

Question 4

What are the 9 muscles innervated by the posterior interosseous nerve?

Answer 4

ECRB, Extensor pollicis brevis, Extensor pollicis longus, Extensor indicis, extensor digitorum communis, Extensor digiti minimi, extensor carpi ulnaris, Abductor pollicis longus, supinator

Question 5

Saturday night palsy/honeymooners palsy affects what nerve

Answer 5

Radial nerve at the spiral groove

Question 6

4 ddx of wrist drop

Answer 6

1. Radial nerve mononeuropathy
2. Lead
3. Posterior cord plexopathy
4. C6/7 radiculopathy

Question 7

What 2 muscles does the radial nerve travel through at the elbow

Answer 7

Brachioradialis and brachialis

Question 8

Where does the radial nerve get entrapped in radial tunnel syndrome?

Answer 8

Between brachialis and brachioradialis

Question 9

What are the 6 extensor compartments

Answer 9

1) APL, EPB
2) ECRB, ECRL
3) EPL
4) EIP, EDC
5) EDM
6) ECU

Question 10

Symptoms of radial tunnel syndrome

Answer 10

Pain with resisted wrist extension, pain with resisted supination, pain with palpation of radial head

Question 11

What structure is involved in PIN syndrome

Answer 11

Arcade of Frohse

Question 12

What is the arcade of frohse

Answer 12

Fibrous band between 2 head of supinator through which PIN goes through

Question 13

Monteggia fracture

Answer 13

Fracture of proximal 1/3 of ulna and dislocation of radial head, which can cause PIN syndrome

Question 14

What muscles does PIN syndrome spare

Answer 14

Triceps, brachioradialis, anconeus, ECRL, ECRB

Question 15

Cheiralgia peristhetica involves what nerve

Answer 15

Superficial radial nerve

Question 16

Symptoms of cheiralgia peristhetica

Answer 16

Paresthesias of dorsal radial aspect of hand

Question 17

Nerve roots of musculocutaneous nerve

Answer 17

C5,6,7

Question 18

What 3 muscles does musculocutaneous nerve innervate

Answer 18

Coracobrachialis, biceps brachii, brachialis

Question 19

What sensory nerve does musculocutaneous branch to

Answer 19

Lateral antebrachial cutaneous nerve

Question 20

Nerve root of axillary nerve

Answer 20

C5, C6

Question 21

What 2 muscles does axillary nerve innervate

Answer 21

Teres minor, deltoid

Question 22

Nerve root of suprascapular nerve

Answer 22

C5, C6

Question 23

What structures does suprascapular nerve pass by

Answer 23

Beneath trapezius to superior scapula at the Suprascapular notch, which is covered by transverse scapular ligament, and then around the spinoglenoid notch

Question 24

What muscles does suprascapular nerve innervate

Answer 24

Supraspinatus and infraspinatus

Question 25

Most commonly involved nerve in neuralgia amyotrophy

Answer 25

Suprascapular nerve

Question 26

Nerve root of long thoracic nerve

Answer 26

C5, 6, 7

Question 27

What muscles does long thoracic nerve innervate

Answer 27

Serratus anterior

Question 28

Medial vs lateral winging: nerve and muscle involved

Answer 28

Medial = LTN and serratus anterior injury

Lateral winging = spinal accessory nerve and trapezius injury