At the end of the first week of development, the zygote has passed through the morula and blastocyst stages and has begun implantation.
The second week is characterized by the development of the bilaminar germ disc.
Day 8 sees the blastocyst partially embedded in the endometrial area over the embryoblast.
The trophoblast differentiates into two layers: an inner layer of mononucleated cells and an outer multinucleated zone.
The inner cell mass differentiates into a hypoblast layer and an epiblast layer, forming the bilaminar germ disc.
An amniotic cavity appears within the epiblast layer.
On day 9 and 10, the blastocyst becomes more deeply embedded in the endometrium.
Trophoblastic lacunae form during this time.
The bilaminar germ disc continues to develop day-by-day.
This period is a crucial stage in embryonic development.

Discover the fascinating world of embryonic development in this quiz! Test your knowledge on the first two weeks of development, from the zygote to the bilaminar germ disc. Learn about the differentiation of the trophoblast and inner cell mass, the appearance of the amniotic cavity, and the formation of trophoblastic lacunae. This crucial stage of development is essential for the formation of the embryo, and this quiz will help you understand the intricate processes involved.