Show:
The Bracket Plexus
NCaaS and EMG
Technical foul
Jump Ball
100

This muscle is innervated solely by the C5 root

  • Serratus anterior
  • Rhomboids
  • Supraspinatus
  • Biceps Brachii

What are the Rhomboids? 

Dorsal scapular nerve. Supraspin is C5-6 (suprascap n), Biceps C5-6 (MC n), Serratus C5-7 (long thoracic n)

100

The most common NCS/EMG findings in myopathies

  • Low amplitude SNAPs
  • Long duration motor units
  • Abnormal spontaneous potentials on needle EMG
  • Decreased recruitment of motor units

What is Abnormal spontaneous potentials on needle EMG?

100

The effect of limb temperature cooling on NCS findings

  • No change in CV, decreased amplitude
  • No change in CV, no change in amplitude
  • Decreased CV, increased amplitude
  • Increased CV, decreased amplitude

What is Decreased CV, increased amplitude?

100

The expected sensory nerve action potential morphology in ALS

  • Normal amplitude and latency
  • Decreased amplitude distally
  • Prolonged latency distally
  • Increased amplitude

What is Normal amplitude and latency?

Only affects motor nerves

200

This muscle is NOT dually innervated

  • Flexor pollicis brevis
  • Gracilis
  • Biceps femoris
  • Lumbricals of the hand

What is the gracilis?

  • Flexor pollicis brevis (median and ulnar)
  • Gracilis (obturator)
  • Biceps femoris (short head- common peroneal, long head-tibial of sciatic)
  • Lumbricals of the hand (median and ulnar)
200

The type of muscle fiber evaluated by EMG

  • Only type Ia 
  • Only type Ib
  • Only type II (steroid myopathies)
  • All of the above

What are Only type 1a fibers?

200

In a newborn, nerve conduction velocities are approximately what percentage of adult values?

  • 50%
  • 25%
  • 100%
  • 75%


What is 50%?

75% by 1 year old, complete by 3-5 years old.

200

This type of injury affects the axon of a nerve but not the supporting connective tissue that results in Wallerian degeneration

  • Neurotmesis
  • Axonotmesis
  • Neurapraxia
  • Just a flesh wound

What is Axonotmesis

  • Neurotmesis (complete transection)
  • Neurapraxia (focal myelin injury->conduction block)
300

This is the most proximal muscle that is innervated by the common peroneal (fibular) nerve

  • Tibialis anterior
  • Short head of biceps femoris
  • Long head of biceps femoris 
  • Peroneus longus

What is the Short head of biceps femoris?

  • Tibialis anterior (deep peroneal)
  • Long head of biceps femoris (tibial)
  • Peroneus longus (superficial peroneal)
300

The condition in which myokymic discharge are usually seen.

  • Radiation plexopathy
  • Acute carpal tunnel syndrome
  • Myasthenia gravis
  • Myotonic dystrophy

What is radiation plexopathy?

300

The only one of the following to be considered an orthodromic conduction for a sensory nerve?

  • Stimulating wrist with pickup at finger
  • Stimulating wrist with pickup over APB muscle
  • Stimulating distal aspect of finger with pickup over the wrist
  • Stimulating distal aspect of finger with pickup over the APB muscle

What is stimulating distal aspect of finger with pickup over the wrist?

300

This is the sensory continuation of the femoral nerve:

  • Lateral femoral cutaneous nerve
  • Obturator nerve
  • Sural nerve
  • Saphenous nerve

What is the saphenous nerve?

400

Of the following, the muscle NOT innervated by the AIN

  • FDP to digits 2 and 3
  • Pronator quadratus
  • FDS to digits 1 and 2
  • Flexor pollicis longus

What is FDS to digits 1 and 2?

400

The scenario most likely to cause Complex repetitive discharges (CRDs)

  • Cervical radiculopathy of 4 weeks duration
  • CTS of 1 year duration
  • Lumbar radiculopathy of 1 week duration
  • Sensory axonal peripheral neuropathy of 2 years duration

What is CTS of 1 year duration?

Usually at least 6 months, sensory neuropathy would have normal EMG.

400

Of the following factors, all can affect H-reflex latency on electrodiagnostics except:

  • Demyelinating sensory neuropathy
  • Demyelinating motor neuropathy
  • Height
  • Weight

What is weight?

400

This is the connective tissue that surrounds fascicles of nerve fibers

  • Epineurium
  • Endoneurium
  • Perineurium
  • Perifasciculum

What is perineurium?

  • Epineurium (entire nerve)
  • Endoneurium (individual axon)
500

This muscle is NOT innervated by the posterior cord of the brachial plexus

  • Triceps
  • Deltoid
  • Biceps 
  • Brachioradialis

What is the Biceps? - Lateral cord innervation

500

The common presentation of conduction block in the forearm

  • Decreased CMAP amplitude with proximal and distal stimulation
  • Decreased CMAP amplitude proximally but not distally
  • Decreased CMAP amplitude distally but not proximally
  • Slowing of conduction velocity across the lesion. 

What is decreased CMAP amplitude with proximal and distal stimulation?

500

An indication that a Martin-Gruber anastomosis is present

  • An initial positive deflection of the CMAP when stimulating median nerve at the antecubital fossa
  • Slowed median nerve CV in the forearm
  • Increased amplitude of median CMAP with distal stimulation as compared to proximal stim
  • An excessively fast ulnar nerve CV in the forearm

What is an initial positive deflection of the CMAP when stimulating median nerve at the antecubital fossa?

500

The cause of miniature end-plate potentials are:

  • A postsynaptic response
  • A pre-requisite for depolarization
  • The result of single muscle fiber depolarization
  • The release of 1 quantum of acetylcholine from the presynaptic terminal

What is the release of 1 quantum of acetylcholine from the presynaptic terminal?