Abstract
On the phasic contraction of the uterus of the nonpregnant rabbit already reported many authors. But as for the contraction of the vagina, little is known.It is reasonably assumed, when ve consider the anatomical relation of the uterus and vagina and their mechanism, that some similar movement must occur to the vagina as to the uterus. Therefore the author intended to inquire into the contraction, if any, and to compare it with that of uterus.A balloon of proper size made of thin elastic rubber was put deep into the vagina from the introitus vaginae or the canal on the abdominal wall specially prepared for the purpose. If the balloon is expanded previously with adequate pressure, the change of its volume due to contraction of the vagina is recorded by means of the optical lever on the bromide paper.The contraction curve shows in most cases relatively regular phasic contraction, having one or one and half cycle per minute. But in some cases after 7-15 days experiments (one or two hours a day), groups of several contractions appeared, and between the e were observed only small or no contraction. These groups occurred roughly once in 5-10 minutes. This state of contraction is similar to that of uterus, which is observed on the rabbit administered with follicular hormone.From those results, it is concluded that the vagina of a non-pregnant rabbit has phasic contraction, which varies according to conditions.
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