Pain relief by electrical stimulation of the central grey issue in people and its reversal by naloxone. Afferent nociceptive fibers (the ones that send data to, rather than within the Mind) travel back for the spinal cord where they sort synapses in its dorsal horn. This nociceptive fiber (located https://johsocial.com/story8490243/the-fact-about-what-are-pain-receptors-that-no-one-is-suggesting