Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 13, 249-254, Copyright © 1975 by Society for the Study of Reproduction

Amplitude Variation of the Pressure Cycles in and Between Segments of the Rabbit Oviduct in vitro

ANTTI TALO 1

1 Department of Obstetrics and Gynecology, Washington University Medical School, St. Louis, Missouri 63110


Nine oviducts excised from estrous rabbits were cut into eight segments of equal length after removal of adhering tissues. The two segments adjacent to the ovarian end were discarded. Intraluminal pressure of the segments was measured by the perfusion method at their uterine end. Amplitude of pressure cycles was measured and compared with the electrical activity that was associated with the contractile events.

Besides spontaneous variation of contractile force, the amplitude of pressure cycles was dependent on the distance of the contractions from the tip of the recording catheter, on the direction of propagation of the contractions, and on the length of the contracting segment, the sensitivity decreasing in that order. Frequency histograms of the amplitudes varied between the segments. The amplitude of the highest pressure cycle was found to best represent the strongest propulsive force and also the contractile force of the segment. It was similar in both ampullary segments, increased from the ampulla to the isthmus, remained constant in the distal half of the isthmus and increased in the proximal half of the isthmus in the uterine direction.

 Submitted on January 14, 1975
Accepted on April 1, 1975






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Copyright © 1975 by the Society for the Study of Reproduction.