Nociceptor neuron

Nociceptor neurons are specialized sensory neurons responsible for detecting potentially damaging or noxious stimuli—including mechanical injury, extreme temperatures, and chemical irritants—and transmitting these signals as electrical impulses toward the central nervous system[1][3]. They are primarily located in dorsal root ganglia (DRG) and trigeminal ganglia. Nociceptors can be classified by their conduction properties into myelinated Aδ-fibers—which transmit sharp, fast pain—and unmyelinated C-fibers—which mediate slow, dull or burning sensations[2]. These neurons express a variety of ion channels and receptors such as TRP channels for temperature sensing and opioid receptors that modulate their activity. Their activation underlies both acute protective responses to injury as well as chronic pathological states like persistent inflammatory or neuropathic pain. Drugs targeting these neurons include opioids that act on opioid receptors at nerve terminals to suppress neurotransmission; NSAIDs that reduce peripheral sensitization; local anesthetics that block action potentials; and corticosteroids that dampen inflammation-mediated activation[2].

Other names

Pain-sensing neuronpain receptor neuronnociceptive sensory neuronpain fiber

Opioids activate opioid receptors on nociceptors to inhibit neurotransmitter release and reduce neuronal excitability[2]. NSAIDs decrease prostaglandin synthesis, reducing sensitization of nociceptors[2]. Local anesthetics block voltage-gated sodium channels in nociceptor axons, preventing action potential propagation.