Here is one paper from 2010 that discusses the various factors involved with nerve repair, in the periphery and central nervous system:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2846285/
It discusses the dorsal roots too.
Quote:
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After peripheral nerve injury, axons readily regenerate. The distal portion of the axon, which is disconnected from the cell body, undergoes Wallerian degeneration. This active process results in fragmentation and disintegration of the axon. Debris is removed by glial cells, predominantly macrophages. Proximal axons can then regenerate and re-innervate their targets, allowing recovery of function.
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Weezie looking at petunias 8.25.2017
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