Abstract

Accessory limbs are a type of ectopic supernumerary growth that may develop after trauma in urodeles. In the experiments described here, the removal of a patch of skin plus the reflection of a large nerve constituted the trauma that induced high proportion of growths in young axolotls. The regenerating axons of the reflected nerve supplied the necessary neurotrophic factor, and the Schwann cells of the same nerve may supply the mitotic cells for blastema formation.

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