The regeneration of the central autonomic descending pathways-comparative aspects

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Although the fibrous scar is formed in the lesion site after the spinal hemisection of the goldfish, many tubules invade the fibrous scar from both rostral and caudal sides of the scar, and eventually bridge the scar. Accordingly, regenerating axons invading the tubules pass the scar. The tubules that induce growth of the regenerating axons might be derived from the blood vessels. In mammals, on the other hand, the structure of the fibrous scar seems to be a factor that impedes axonal regeneration