素材 - Sectional view of a human embryo in the advanced blastocyst stage. The outer layer (green), the trophoblast, the trophoblasts are almost indistinguishable. The inner mass of o cells is called embryoblast. Some cells are dividing in the foreground. The blastocyst is close to the endometrium (bottom right).
Sectional view of a human embryo in the advanced blastocyst stage. The outer layer (green), the trophoblast, the trophoblasts are almost indistinguishable. The inner mass of o cells is called embryoblast. Some cells are dividing in the foreground. The blastocyst is close to the endometrium (bottom right).