Effect of particle size on time course of transport of surrogate ova through the rabbit oviduct

B. J. Hodgson, H. B. Croxatto, M. I. Vargas, C. J. Pauerstein

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9 Citations (Scopus)


The time course of transport of plastic microspheres of 100, 200, 400, 800, and 1000 μ diameter through the rabbit oviduct was studied under various hormonal conditions. During estrus, the rabbit oviduct rapidly transports particles of 200 μ diameter to the uterus. After ovulation, the passage of these particles is delayed, first at the ampullary isthmic junction, and then along the isthmus, perhaps influences by a second site of resistance at the uterotubal junction. Particles of 100 μ diameter are not subject to these delays but pass rapidly to the uterus. Our data support the idea that the rapid passage of 100 μ spheres reflects a size related inability of the resisting 'gates' to limit their passage. Pharmacologic doses of estrogen act to prolong or increase the resistance to particle passage at the ampullary isthmic junction and apparently also accelerate transport through the isthmus. Progesterone presumably increases the efficiency of the 'gate' at the ampullary isthmic junction, hastens transport through the isthmus, and seems to 'open the gate' at the uterotubal junction. Further experiments are required to prove or negate these inferences.

Original languageEnglish
Pages (from-to)213-217
Number of pages5
JournalObstetrics and Gynecology
Issue number2
Publication statusPublished - 1976

ASJC Scopus subject areas

  • Obstetrics and Gynaecology


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