Effect of Ovulation and Progesterone or Estrogen on the Responses of the Rabbit Oviduct to Nerve Stimulation1

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Abstract
The effects of ovulation and estrogen or progesterone on the contractility of circular and longitudinal preparations of isthmus and ampulla of rabbit oviduct were investigated. In the estrogen and human chorionic gonadotropin treated group the isthmus was more sensitive to nerve stimulation at certain frequencies than it was in the other groups. Maximum tension to nerve stimulation at 26.degree. C and to phenylephrine at 10.degree. C was not significantly different between groups. The relaxation half-time to nerve stimulation at 26.degree. C and to Mg at 10.degree. C was not significantly different between groups. During either normal or altered ovum transport apparently neither relaxation of the smooth muscle, Ca sequestration nor maximum tension is altered. In the oviductal isthmus, the sensitivity of the tissue to nerve stimulation was increased by estrogen treatment.

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