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2019 BCE
Week 2
This week the implantation of the human embryo has been completed. Its growth will be very rapid from this moment. The embryo appears in the center, like a bilaminar disk and is located between 2 cavities, the amnion and the yolk sac. On the outside, we find the trophoblast that will form the fetal part of the placenta. -
Week 1
During the first week, fertilization occurs, the union of the female cell with the male. Each one has 23 chromosomes, together they create a 46 chromosome cell that travels from the middle third of the fallopian tube to the uterus, where it will be implanted to begin its development.