UE Mononeuropathy Flashcards
Nerve root origin of radial nerve
C5-T1
What 4 muscles does the radial nerve innervate before it splits at the elbow?
Triceps, ECRL, anconceus, brachioradialis
What 2 branches does the radial nerve split into at the lateral epicondyle?
Posterior interosseous nerve (motor) and superficial radial nerve (sensory)
What are the 9 muscles innervated by the posterior interosseous nerve?
ECRB, Extensor pollicis brevis, Extensor pollicis longus, Extensor indicis, extensor digitorum communis, Extensor digiti minimi, extensor carpi ulnaris, Abductor pollicis longus, supinator
Saturday night palsy/honeymooners palsy affects what nerve
Radial nerve at the spiral groove
4 ddx of wrist drop
- Radial nerve mononeuropathy
- Lead
- Posterior cord plexopathy
- C6/7 radiculopathy
What 2 muscles does the radial nerve travel through at the elbow
Brachioradialis and brachialis
Where does the radial nerve get entrapped in radial tunnel syndrome?
Between brachialis and brachioradialis
What are the 6 extensor compartments
1) APL, EPB
2) ECRB, ECRL
3) EPL
4) EIP, EDC
5) EDM
6) ECU
Symptoms of radial tunnel syndrome
Pain with resisted wrist extension, pain with resisted supination, pain with palpation of radial head
What structure is involved in PIN syndrome
Arcade of Frohse
What is the arcade of frohse
Fibrous band between 2 head of supinator through which PIN goes through
Monteggia fracture
Fracture of proximal 1/3 of ulna and dislocation of radial head, which can cause PIN syndrome
What muscles does PIN syndrome spare
Triceps, brachioradialis, anconeus, ECRL, ECRB
Cheiralgia peristhetica involves what nerve
Superficial radial nerve
Symptoms of cheiralgia peristhetica
Paresthesias of dorsal radial aspect of hand
Nerve roots of musculocutaneous nerve
C5,6,7
What 3 muscles does musculocutaneous nerve innervate
Coracobrachialis, biceps brachii, brachialis
What sensory nerve does musculocutaneous branch to
Lateral antebrachial cutaneous nerve
Nerve root of axillary nerve
C5, C6
What 2 muscles does axillary nerve innervate
Teres minor, deltoid
Nerve root of suprascapular nerve
C5, C6
What structures does suprascapular nerve pass by
Beneath trapezius to superior scapula at the Suprascapular notch, which is covered by transverse scapular ligament, and then around the spinoglenoid notch
What muscles does suprascapular nerve innervate
Supraspinatus and infraspinatus
Most commonly involved nerve in neuralgia amyotrophy
Suprascapular nerve
Nerve root of long thoracic nerve
C5, 6, 7
What muscles does long thoracic nerve innervate
Serratus anterior
Medial vs lateral winging: nerve and muscle involved
Medial = LTN and serratus anterior injury
Lateral winging = spinal accessory nerve and trapezius injury
