And so what that means is we have this continual source of nutrition and oxygen that comes from the mother. We also form the embryonic stock that eventually becomes that umbilical cord. And this connection between the corian and the blood vessels of the mother eventually forms the placenta. Now notice this is our umbilical vesicle that eventually becomes part of the umbilical cord. We also have this amniotic cavity that eventually grows in size in order to accommodate that embryo, that organism that develops inside, as shown in the following diagram. So this is the amnioc, this is the amniotic cavity.