The shaping of the mesometrial proamniotic cavity in the mouse. Are there various mechanisms?
The existence of an alternative pathway of the shaping of the mesometrial proamniotic cavity (based upon the examination of several hundreds 6-day mouse embryos), which occurs more frequently than mentioned by other authors, is described. The observed pathway begins with the invagination of the mesometrial pole of the implanted blastocyst, the early proamniotic cavity thus communicating with the uterine lumen. Subsequently, it is occluded by the ectoplacental cone. The phylogenetic aspects of these observations are discussed.
D000818:Animals; D005260:Female; D051379:Mice / Q000196:embryology*; D009215:Myometrium / Q000196:embryology*; D014599:Uterus / Q000196:embryology*