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PubMed1979

[Sympathoactivating and sympathoinhibitory afferent fibers of the vagus and splanchnic nerves].

Changes in frequency of tonic impulses in efferent sympathetic fibers of the left splanchnic nerve on stimulation (10 V, 10--20 Hz, 1 ms) of afferent fibers of the right splanchnic nerve and of both trunks of the vagus nerve at the cervical and abdominal levels have been studied in experiments on cats. It is established that there are sympatho-inhibitory and sympatho-activatory fibers whose quantitative correlation is different in various trunks. Sympatho-inhibitory influencies are most marked on stimulation of vagus nerve ventral branch and sympatho-activatory ones on stimulation of right splanchnic nerve. At the cervical level, in vagal left trunk sympatho-inhibitory fibers preponderate but in the right one another correlation occurs. In abdominal cavity the distribution of both types of fibers appears to have organ principle. Fibers innervating stomach have sympatho-inhibitory action but those innervating small intestine--sympatho-activatory. This suggests the hypothesis about the role of these fibers in digestion regulation. The central cholinolytic amysil abolishes sympatho-inhibitory effects but not sympatho-activatory ones.

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