Editing Stimulus modality (section)

===Nerve fibers for temperature===

Warm and cold sensitive nerve fibers differ in structure and function.  The cold-sensitive and warm-sensitive nerve fibers are underneath the skin surface.  Terminals of each temperature-sensitive fiber do not branch away to different organs in the body. They form a small sensitive point which are unique from neighboring fibers. Skin used by the single receptor ending of a temperature-sensitive nerve fiber is small.  There are 20 cold points per square centimeter in the lips, 4 in the finger, and less than 1 cold point per square centimeter in trunk areas.  There are 5 times as many cold sensitive points as warm sensitive points.<ref name = "mcglone"/>