Distribution curve obtained from a large number of persons showing the minimal skin
temperature that will causepain. (Modified from Hardy DJ: Nature of pain. J Clin Epidemiol
4:22, 1956.) Chapter 48 Somatic Sensations: II. Pain, Headache, and Thermal Sensation
585
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pain and makes the person keep trying to relieve the cause of the pain. On entering the spinal
cord from the dorsal spinal roots, the pain fibers terminate on relay neurons in the dorsal horns. Here
again, there are two systems for processing the pain signals on their way to the brain, as shown in
igures 48-2 and 48-3.
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