Which layers of 14-17 days germ disk do you know?

Which layers of 14-17 days germ disk do you know?

1. Cytotrophoblast and syncytiotrophoblast


2. Embryoblast and trophoblast


3. Ectoderm and entoderm


4. Synkaryon and zygote

*Ectoderm, mesoderm and endoderm