Methyl-methacrylate vascular corrosion casts of the oviducts were prepared in 7 rabbits which were 2–3 weeks pregnant. Scanning electron microscopy of the acrylic casts revealed little change in tubal microvascular connections when compared with control oviducts. Venous distension in the isthmic subserosal venous plexus, ampullary subserosal vasculature and in the fimbrial core was substantially greater than that observed in controls. These changes are interpreted as indicating a sensitivity of tubal microvasculature to the increased levels of circulating placental hormones in pregnancy. The implications of this interpretation in the role of tubal microvasculature at the time of ovulation are discussed.

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