Molecular Classification
Neuron, Sensory Neuron, Afferent Neuron, Nociceptor
Other Names
Unmyelinated C-fiber, Nociceptive C-fiber, Polymodal C-fiber, Bronchopulmonary C-fiber
Disease Roles
Chronic painInflammationAsthma

C-fiber Afferent Neuron Overview

C-fiber afferent neurons are a class of unmyelinated sensory nerve fibers that transmit information from the periphery to the central nervous system. They are primarily responsible for conveying slow, diffuse, and lingering sensations such as burning pain, temperature (warmth), itch, and certain types of touch. Activation leads to sensations associated with chronic pain conditions due to their role in persistent/burning pain. In airways/lungs ("bronchopulmonary" C-fibers): Mediate cough reflexes; modulate breathing patterns; contribute to airway constriction/inflammation responses during disease states like asthma or infection.

Mechanism of Action

Biological Functions

Nociception
Thermoreception
Mechanoreception
Chemoreception
Itch sensation
Touch sensation
Homeostasis
Reflex regulation

Disease Associations

Chronic pain
Inflammation
Asthma
Cough
Neuropathic pain
Visceral pain

Safety Considerations

  • Potential for off-target effects on other sensory modalities
  • Development of tolerance to analgesic therapies