EMG

Question 1

Insertional activity

Answer 1

Burst of activity of a needle insertion

Increased with denervated muscle and many muscular diseases

Question 2

Electrical silence

Answer 2

Once needle is inserted, normal muscle produces nothing

Question 3

Motor unit potentials

Answer 3

Decreased in LMN injury

Increased with reinnervation of previously denervated

Question 4

Complete LMN lesions

Answer 4

Fibrillation potentials

Question 5

Partial LMN lesions

Answer 5

Fibrillation and fasciculation potentials

Question 6

Fasciculations

Answer 6

Spontaneous contraction of most/all fibers

Question 7

Fibrillation potentials

Answer 7

Spontaneous contractions of individual fibers

Evident with denervation 1-3 weeks