5,000,000 sperms simultaneously swim to theirs end point - - hiding in the oviduct egg. Although this army is so huge, but finally can break through the egg actually only one.
Egg's outer layer is being protected by a transparent thin films, this causes it to look like elephant aerosol in the heavenly body attractive star.
Finally meets after all sorts of barrier sperm with the egg, the egg external coat periplast becomes the checkpoint which their first needs to break through.
This time, the sperms drill to on egg's outer wall, the tail is whipping unceasingly, egg along with sperm rear part movement slowly anti-clockwise rotation.
This time sperm's head already has wormed one's way into, we also may see its middle and the rear part, it looks like the drill bit which revolves unceasingly, whips in the tail under the actuation enters the egg diligently.
The sperm already entered the egg, completes the fertilization.
Fertilized egg one divides into two.
Fertilized egg fast fission.
Fertilization latter 8 days. The embrionic tooth completes " to land “, inserts the endometrium slightly. This time it splits the growth is several hundred cells.
The fertilization latter 6 weeks, the human form has visible faintly. By now, under embryo palpitation by 140-150 each minute. It’s two times of mother palpitation.
This time appearance and young pig, cat, puppy's embryo not wide difference.
This is as long as 11 week embryos. Enters to pregnancy of fourth month, embryo is form from 5 centimeters as long as 10 centimeters.
Embryo.
