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