Peripheral Nerves

Question 1

Sturther ligament is associated with entrapment of

Answer 1

Median nerve at elbow

Question 2

Which nerve innervate the serratus anterior muscle

Answer 2

Long thoracic nerve

Question 3

What is mononeuritis multiplex?

Answer 3

> 2 nerves involved in non-contiguous area
Like:
Autoimmune diseases (SLE, RA, sarcoid)
Vasculitis (polyarteritis nodosa)

Question 4

Rate of nerve regeneration

Answer 4

1mm/d
1inch/mo

Question 5

Sunderland classification of nerve injury

Answer 5

I: intact basement membrane (physiologic rather than anatomic transection/ nerve in continuity)
II: complete interruption of axons with intact endoneurium.
III: axon + endoneurium disrupted with intact perineurium.
IV: axon + endoneurium + perineurium distupted with intact epineurium.
V: Complete transection

Question 6

Timing of nerve repair

Answer 6

Rule of 3
3 day: sharp clean laceration
3 wks: blunt laceration, blast injury
3 mo: stretch, compression

Question 7

Idiopathic brachial plexus neuropthay

Answer 7

Parsonage-Turner Syndrome

Question 8

Posture/sign of median nerve entrapment at proximal arm

Answer 8

Benedictine sign (orator’s hand)
Pt cannot make a complete fist
Thumb no flexion
2nd partial
3rd weak
4th, 5th normal

Question 9

Cause of median nerve entrapment at proximal arm

Answer 9

Trauma
Saturday night palsy
Honeymooners palsy
Pressure from crutch head

Question 10

Causes of median nerve entrapment at distal arm

Answer 10

Supracondylar spur
+
Ligament of Struther (median n. passed under this ligament

Question 11

Nerve entrapment in Meralgia parasthetica

Answer 11

Lateral femoral cutaneous nerve