What are small nerve fibers?
 

Are they axonal?

https://en.wikipedia.org/wiki/Small_...ral_neuropathy

There are 4 types of sensory afferent fibers ... the C fibers are unmyelinated.

The other 3 have various degrees of axonal myelin on them.

This explains the 4 types. I seem to be putting this up here over and over lately.

http://faculty.washington.edu/chudler/cv.html

You would have to look at your biopsy results to see which fibers were measured.

Mrs D,
I am confused because the environmental doctor got back to me and said that they can't think of any toxins exposure that could be causing a decrease in small fiber nerves because the exposures that would cause pn affect the axons or cause demylenation.
Isn't the damage and death of the small fiber nerves axonal?

All nerve cells have axons. Some have unmyelinated (uninsulated) axons, and others have myelinated ones.(to various extents).

https://en.wikipedia.org/wiki/Neuron