nonmyelinated

The presence of myelination allows a conduction velocity of 4-24 meters per second, significantly faster than nonmyelinated axons.

The cornea, one of the other exposed mucous membranes, contains "free" nerve endings served by nonmyelinated axons.

Merkel's discs are arborizations of nonmyelinated axons that end in terminals on specialized tactile cells and which detect sustained touch and pressure.

However it is not certain that the stimulation of nonmyelinated C-fibers leads to cough with a reflex as it's meant in physiology (with its own five components): this stimulation may cause mast cells degranulation (through an asso-assonic reflex) and edema which may work as a stimulus for rapidly adapting receptors.