So we have these blood vessels that now are in slight contact with this region of our embryo. So by the way, this is what eventually forms the corian. So in a way, this is our corion. 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.