McComb P F, Halbert S A, Gomel V
Fertil Steril. 1980 Oct;34(4):386-90.
Pregnancy following reversal of an ampullary segment in the rabbit oviduct has occurred only sporadically, and then usually after repeated mating. To explain this phenomenon it has been postulated that the direction of ciliary beat in the reversed ampullary segment must revert to the normal pro-uterine direction. To test this hypothesis a segment of the ampulla was reversed by microsurgery in 10 rabbits. These were then bred repeatedly for as long as 28 weeks. A single pregnancy, at 10 weeks, ensued. Observation of ampullary transport in vivo showed that muscular activity in the reversed ampullary segment may occasionally overcome the adverse, pro-ovarian ciliary currents that were found to persist in subsequent in vitro examinations. Scanning electron microscopy confirmed normal ciliation in the reversed segment. These observations may explain the occasional transport of an ovum across the reversed ampullary segment and an isolated pregnancy in the mated rabbit.
兔输卵管壶腹部节段反转后怀孕的情况只是偶尔发生，而且通常是在多次交配之后。为了解释这一现象，有人推测反转的壶腹部节段中纤毛摆动的方向必须恢复到正常的向子宫方向。为了验证这一假设，对10只兔子进行显微手术反转了壶腹部的一个节段。然后让它们反复交配长达28周。10周时出现了一次怀孕。对壶腹部体内运输的观察表明，反转的壶腹部节段中的肌肉活动偶尔可能会克服在随后的体外检查中发现持续存在的不利的向卵巢纤毛流。扫描电子显微镜证实反转节段中有正常的纤毛。这些观察结果可能解释了卵子偶尔穿过反转的壶腹部节段以及交配兔子中出现的孤立怀孕现象。
