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Development of somato sympathetic responses at the early stages of post natal ontogenesis in cats



Development of somato sympathetic responses at the early stages of post natal ontogenesis in cats



Fiziologicheskii Zhurnal SSSR Imeni I M Sechenova 66(7): 1115-1124



In adult cats and 1-16 day old kittens, repeated stimuli of less than 1/s and supramaximal strength applied to afferent fibers of nervus [n.] ischiadicus evoked the multicomponent responses recorded from efferent fibers of n. hypogastricus. Latencies of responses components decreased during postnatal development. In all the animals 3 basic responses remained unchanged after Th10-12 chordotomy. Stimulation of kittens afferent somatic fibers with frequency of 10/s and of variable strength enhanced the sympathetic nerve activity and in rare occasions suppressed it. In adult animals the sign of sympathetic nerve response depended on the level of spontaneous sympathetic activity and on the stimulus strength. This relation remained unchanged after the chordotomy. In chordotomized kittens repeated stimuli applied to somatic nerve produced the sympathetic nerve activation alone.

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Accession: 005135378

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