Question

What are the two layers formed from trophoblast differentiation during implantation?

Options

• Inner cell mass and blastocoel

• Amnion and chorion

• Cytotrophoblast and syncytiotrophoblast

• Ectoderm and mesoderm

Answer 1

During implantation, the trophoblast differentiates into two distinct layers. The cytotrophoblast is the inner cellular layer that produces cells for trophoblast growth. The syncytiotrophoblast is the outer multinucleate layer that invades the endometrium and secretes hCG (human chorionic gonadotropin).