#nerve fiber

• Unmyelinated — Lacking a myelin sheath; a nerve fiber or axon devoid of the protective, insulating structural lipid layer. Amielinic (unmyelinated) fibers (such as type C fibers) are characterized by a significantly slower nerve impulse conduction velocity compared to myelinated ones, playing an essential functional role in transmitting dull pain sensations, temperature, and regulating autonomic nervous system connections.