Abstract
There is a striking difference in the potential for regeneration of injured axons in the central and peripheral nervous systems, which is important in neurotoxicologic studies. In contrast to the former, there is a ready mechanism for replacement of peripheral nerve axons that have degenerated following exposure to toxins, where long-distance axon regeneration and substantial functional recovery can occur. This relates at least in part to the nature of the glial and other supporting cells of the peripheral nerve. To provide background for these events, data on regeneration following traumatic injury to peripheral nerve are reviewed. This is followed by descriptions of nerve fiber regeneration after experimental exposure to 3 peripheral nerve axonopathic toxins, organophosphate tri-ortho-tolyl phosphate, the industrial chemical carbon disulfide, and the antituberculosis drug isoniazid.
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