The influence of visceral mechanoreceptors on sympathetic efferent discharge in the cat

AUTOR(ES)

Floyd, K.

RESUMO

1. Recordings have been made from eighty-three single sympathetic efferent units in the hypogastric nerve in two types of preparation. In all animals the baroreceptors were denervated to exclude changes in sympathetic discharge resulting from any variations in arterial pressure, and the spinal cord was sectioned at the 6th lumbar segment to exclude changes in efferent discharge that might have been due to pelvic nerve afferents from the bladder or other viscera. In some animals the afferent pathways were sectioned from all pelvic and lower abdominal viscera other than the bladder, so that the vesical afferent pathway was the only neural pathway that might mediate reflex events from these viscera. The hypogastric nerve afferent pathway was excited by bladder distension or by bladder contractions induced by electrical stimulation of the sacral cord.

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