MUSCLE PHYSIOLOGY

Detailed explanation-1: -C fibers (group IV fibers) are 0.4-1.2 mm in diameter, unmyelinated, have a slow conduction velocity (0.5-2.0 meters/sec), and are activated by a variety of high-intensity mechanical, chemical and thermal stimulation and carry information from polymodal nociceptors.

Detailed explanation-2: -C-type fibers are unmyelinated fibers that form one of these groups, and they are involved in the afferent transfer of temperature, burning pain, and itch from the periphery to synapse, principally in lamina I and II of the dorsal spinal horn.

Detailed explanation-3: -Structure. C fibers are unmyelinated unlike most other fibers in the nervous system. This lack of myelination is the cause of their slow conduction velocity, which is on the order of no more than 2 m/s. C fibers are on average 0.2-1.5 m in diameter.

Detailed explanation-4: -Compared to myelinated neurons, unmyelinated neurons are slower in terms of conducting impulses and are found in the peripheral nervous system (especially visceral nervous system) and the gray matter of the nervous system.