The journey of the egg during pregnancy
From ovulation to implantation the egg makes a long journey to the uterus. The egg or oocyte is released by the ovary. The oocyte goes up in the tube where it will meet the spermatozoa that have come to meet it.
Upon fertilization, the egg will undertake the reverse journey of the spermatozoa to nest in the uterus.
With the help of the contractions of the proboscis and the beating of the vibratile cilia that line it, the fertilized egg will descend into the uterus in three or four days.
Until the seventh day, the egg will float in the uterus while waiting for the uterine wall to be ready to receive it.
On the seventh or eighth day, the blastocyst will begin to implantation in the uterus.
Ovum travel, egg fertilization and egg implantation
On the ninth day after fertilization, the blastocyst is completely buried in the endometrium. The hole he formed is blocked by a clot.
The cells of the eggs will cling to the mucous membranes of the uterus thus allowing the establishment of exchanges between the mother and the child. The fertilized egg will develop a network of blood vessels.
It is only from the third week of pregnancy that the embryo will isolate itself from the egg to which it will remain connected by the umbilical cord.
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