Small nerve fibers - Spine
 

Do small nerve fibers of the spine regenerate? Can them affect the small nerve fibers of others limbs?

Small Nerve Fibers are only in the skin and smooth muscle. The spine is a cord and it supplies the large nerve fibers that supplies the medium that supplies the small.

The nerves within the spinal cord are CNS nerves, not peripheral ones. They are not small fibers and are all myelinated.

A technical point--
 

--there are small nerve fibers that stem from the dorsal root ganglia near the spine, but this is not in the spine, nor part of the larger myelinated fibers that begin in the nerve roots proper.