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[Study of the stimulating effect of the sympathetic stem on the stomach contraction].

Stimulation of the sympathetic stem chest portion induces enhancement rather than suppression of gastric contractions. The activating effect is more obvious under conditions of the alpha- and beta-adrenoreceptors blockade with phenolamine and obsidan, and eliminated with the smooth muscle serotoninoreceptors blocking agent lisergol. The findings suggest that the sympathetic stem includes some serotoninergic neural fibres exerting a strong effect upon gastric and intestinal contractions. A previously unknown serotoninergic part of the vegetative nervous system controlling the internal organs functions, seems to exist in the organism.