Central pathways for pain The axons of primary afferent nociceptors .Entering the spinal cord via the dorsal root terminating in the dorsal horn of the spinal gray matter Contacting spinal neurons that transmit the pain signal to brain sites involved in pain perceptionCentral pathways for pain The axons of primary afferent nociceptors •Entering the spinal cord via the dorsal root •Terminating in the dorsal horn of the spinal gray matter •Contacting spinal neurons that transmit the pain signal to brain sites involved in pain perception