Requirements for implantation
In order for the zygote to move from the tube (fallopian tube) to the site of its implantation in the uterus, the muscles of the tube must contract in Richutng Uterus. In addition, a uterus-directed flow of fluid and the ciliary beat occurs. During transport, the mature egg cell undergoes cell division.
Up to the eighth cell division, we speak of an omnipotent egg cell. This means that if a cell were to detach from this multi-cellular structure, it could develop into an independent organism. The egg cell reaches the lining of the uterus in the state of a blastocyst.
On the outside is the trophoblast, inside the embryoblast in the liquid-filled space. The differentiation of the trophoblast is decisive for the uterine lining to accept the implantation of the individual cell.
