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. Inside the amniotic cavity, we have the fluid that basically acts as a nutritious source for that embryo. It also absorbs some of that shock that the embryo can actually experience. And this entire section is the coreonic cavity.