In humans so far we don't know the answer to this question.
But I did find a link to a study in animals suggesting that
dorsal root damage precedes sensory neuron death in the periphery.
http://www.ncbi.nlm.nih.gov/pubmed/21924225
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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