Classification of Fiber Type

Question 1

In regards to conduction velocity small diameter fibers are fast or slow?

Answer 1

Slow

Question 2

Why are small diameter fibers slower?

Answer 2

Because they provide more resistance to flow of current

and have less insulation from myelin

Question 3

In regards to amplitude of action potential small diameter fibers have higher or lower amplitude

Answer 3

Lower amplitude

Question 4

Why do small diameter fibers have a low amplitude

Answer 4

Because potential change across the membrane is smaller

Question 5

How can one distinguish small diameter from large diameter fibers?

Answer 5

By size of EMG amplitude

Question 6

In regards to threshold of stimulus small diameter fibers have a lower or higher threshold for stimulation?

Answer 6

Higher

Question 7

Why do small diameter fibers have a higher threshold for stimulation?

Answer 7

Because they offer more resistance to current flow

Question 8

What type of fibers will require higher intensity of e-stim to activiate?

Answer 8

C fibers - Type IV

(Postganglionic ANS fibers)