Abstract
The embryo enters the uterus at the morula stage of development. The progestational response of the uterus is characterized by the enlargement of the uterine lumen near the centre of the right uterine cornu into a large spherical chamber in which the blastocyst undergoes nidation, and by a pronounced hypertrophy of the uterine glands on all the sides of the implantation chamber. The implantation of the blastocyst is circumferential, and the embryonic disc is directed towards the side of the uterus which is between the mesometrial and the lateral sides. The primitive amniotic cavity is formed by cavitation and the definitive amnion is later formed by the formation of folds from the margin of the embryonic disc.
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