STUDIES ON NEUROPHYSIOLOGY OF VAS-DEFERENS

  • 1 January 1977
    • journal article
    • research article
    • Vol. 15  (2) , 112-116
Abstract
In order to investigate the mechanism of sperm transport along the genital ducts, intraluminal pressure of isolated segments of the vas deferens [from rabbits and dogs] was recorded in vivo. Responses to filling and mechanical as well as pharmacologic and electric stimulation of the autonomic nervous system were monitored. Contraction waves were initiated in response to the stretch of filling and from mechanical stimulation. Pharmacologic response was variable. Low doses of .alpha.-adrenergic stimulant produced an increase in frequency of the contraction wave. Large doses of the same drug induced strong contraction of the entire vas. .alpha.-Blocking drugs did not alter the rhythmic activity of the vas. .beta.-Adrenergic stimulation blocked peristaltic activity, while administration of parasympathomimetic drugs increased the force of contraction. Electric stimulation of the hypogastric nerve produced strong sustained contractions. These data suggest that, whenever stretched, the vas deferens responds by regular peristaltic waves of low amplitude. These peristaltic waves can be enhanced by sympathomimetics or electric stimulation of the sympathetic system. The contents of the vas are propulsed into the urethra through strong rhythmic contractions of the entire vas.

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