Abstract
Fibres of dorsal root III were counted in the frog Discoglossus pictus up to 12 weeks following metamorphosis in both skin-grafted and control frogs. There was a progressive, slight increase in the numbers of myelinated fibres in all animals throughout the investigation. The numbers of unmyelinated fibres, however, increased nearly two-fold between 7 and 14 days postmetamorphosis, there being no differences between skin-grafted and normal frogs. After the maximum values had been reached, the numbers of unmyelinated fibres slightly decreased and remained stable thereafter. Good correlation was observed between the increase in the number of myelinated fibres and the increase in body weight, but not for unmyelinated fibres which were highly variable over all weights examined.
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