Nociception

In the last century, neurons have been classified according to conduction velocity, into groups A, B, and C.^{[Purves et al., 2018]} However, as more became known about neurons, different classifications arose within the groups, and entirely different groups arose for classification of motor neurons.^{[Purves et al., 2018]} The terms are still used for nociceptors; A-fibres are fast-conducting neurons that transmit sensory information about touch, pain, and temperature, whereas C-fibres are slow-conducting non-discriminating neurons that transmit sensory information about touch, pain, temperature, and itch sensations.^{[Purves et al., 2018]}

Reference:
Purves D, Augustine GJ, Fitzpatrick D, et al. Neuroscience, 6^th edition. New York, New York: Oxford University Press, 2018.

Other references used on slide:
Chakravarty A, Sen A. Migraine, neuropathic pain and nociceptive pain: towards a unifying concept. Med Hypotheses 2010; 74 (2): 225–231.

Steeds CE. The anatomy and physiology of pain. Surgery 2016; 34 (2): 55–59.