Nociceptor: pain senseing neuron
https://en.wikipedia.org/wiki/Nociceptor#cite_note-7
See "location".
Interestingly acording to a couple of Quora posts and some NHS documentation the brain, parts of the spine and high stress tissue are exempt from haveing these and insted send signals of pain by diffrence in expected blood presure in these organs.

I'm running MOBA 'crash courses' for anyone who wants to learn the basics of MOBA's and/or play some games today up till 3pm today (we have 40 people coming over past then so the house is going to be very noisy.).