Lockdown Embryology with Prof Alice Roberts #2: Week 2 

The embryo has implanted in the uterus. Now it starts to grow and differentiate, and we see the development of the two-layered germ disc that will develop into a tiny body, and the proliferation of tissues that will form the placenta. By the end of the second week, the embryo is attached to the early placenta by a connecting stalk - the precursor of the umbilical cord.