Notice what we also form is something called the umbilical vesicle. And the umbilical vesicle will eventually become part of the umbilical cord. Now we have these inner cell mass that eventually opens up and creates this cavity inside known as the amniotic cavity. And this will eventually is the place. This will eventually be the place where that embryo is actually found, where that individual is actually found, as we'll see in just a moment. Now notice another thing that actually happens is we form this surrounding layer of epithelial cells around that embryo that implanted.