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Last updated: Sun, Jun 18, 2017
The events on the periphery following an injury are complex. The increased sensitivity of injured tissue is partially but not completely explained by peripheral processes, that is, processes that occur at the location of the injury. Also not explained so far is how the firing of a certain group of neurons can result in the feeling that we call "pain." Also not explained: When the receptive field of an individual neuron is from 3/8" up to 2" across, how are we able to know precisely where a pain is coming from? This and much more requires a central nervous system for its explanation.