A voltage gated sodium channel expressed in many free nerve endings. Action potentials initiated by these channels seem to be connected with the general sensation of pain. Encoded by gene SCN9A. 

University of Rochester

Peripheral receptors and nerve fibers that respond to pain. There are 3 different kinds of painful stimuli nociceptors can be attuned to: chemical, physical, and thermal. Some nociceptors respond to itch sensations. 
- TRPV1 (temperature)
- TRMP3 (higher temperature)
- CMR1 (cold)
- Nppb (itch)
- Nav 1.7 (mechanical pain)

Nociceptors

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

A family of transient receptors that detect compounds with vanilloids (compounds with a vanillyl group). The type of receptor determines the type of pain information detected. 
- TRPV1
- TRPM3
- TRPM8
- TRP receptors for itching

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