Classical histological preparations of the metasympathetic nervous system treated with silver salts were compared with isolated neuron cultures to study non-electrical functions of the neurons. A hypothesis of a tissue trophic effect of the nervous tissue's receptors, is advanced. Proteolytic enzymes were shown to be a growth factor for surrounding tissues and to play a role of trophic agents. A permanent restructurisation seems to occur in formed plexuses of adult healthy animals.
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