Peripheral nervous system pain transmission fibers

The "Peripheral nervous system pain transmission fibers" are groups of sensory nerve fibers (primarily A-delta and C fibers) within the peripheral nervous system that respond to noxious (painful) stimuli and transmit this information to the central nervous system. A-delta fibers are myelinated and transmit fast, sharp, localized pain, while C fibers are unmyelinated and transmit slow, dull, diffuse pain. These fibers are integral to the process of nociception and are modulated (directly or indirectly) in many therapeutic strategies for pain management, but they do not represent a distinct molecular target like a receptor, ion channel, or enzyme. Molecular targets relevant to these fibers include ion channels (e.g., sodium channels), receptors (such as TRPV1, opioid receptors), and neuropeptides (such as substance P and CGRP).

Other names

Pain fibersPeripheral afferent nociceptorsA-delta fibersC fibers

Drugs interacting with these fibers typically block voltage-gated sodium channels to inhibit action potential propagation (e.g., local anesthetics, anticonvulsants), activate or desensitize the TRPV1 receptor (e.g., capsaicin), bind and activate opioid receptors to inhibit neurotransmitter release, or reduce inflammatory mediator release or signaling.