Describe the role of nerves in amphibian regeneration.
- It has been observed that soon after amputation nerves invade the regeneration blastema. If the stump is denervated by cutting the nerves supplying the limb as they emerge from the spinal cord, and are prevented from regrowing into the site of amputation them regeneration fails to occur. The apical cap is not formed. In larval urodeles,denervation results in large scale regression of stump tissues and the entire
limb stump may disappear. If the nerve fibers are allowed to regrow into the stump
before a thick skin forms on the wound surface regeneration may be reintiated. These studies have shown with certainty that the presence of nerves is essential for
regeneration of the limb. A number of experimental studies have been made to
understand the nature and mechanism of nerve influence on limb regeneration in
urodeles. The nerves are believed to produce a "trophic influence" on the blastema
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