what are three major difference between the pain and touch pathways?
first, they differ with respect to their nerve endings in the skin The touch pathway is characterized by specialized structures in the skin; the pain pathway has only free nerve endings.
Second, they differ with respect to the diameter of their axons. The tough pathway is swift anduses fat, myelinated Aβ fibers; the pain pathway is slow and uses thin, lightly myelinated Aδ fibers and unmyelinated C fibers.
Third, they differ with respect to their connections in the spinal cord. Branches of the Aβ axons terminate in the deep dorsal horn; the Aδ and C fibers branch, run within the zone of Lissauer, and terminate within the substantia gelatinosa.