
doi: 10.1242/dev.17.3.527
pmid: 6069182
ABSTRACTThe sequence of events in the orientation of the blastocyst is described. Six a priori mechanisms for orientating the blastocyst are presented. It is concluded that the only mechanism fulfilling the available morphological and experimental observations is one in which the inner cell mass is free to travel round the inside of the trophoblast shell once the latter has become fixed to the uterine epithelium.
Microscopy, Electron, Uterus, Animals, Female, Embryo Implantation, Ovum
Microscopy, Electron, Uterus, Animals, Female, Embryo Implantation, Ovum
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