So this is basically our umbilical vesicle and this is basically the amniotic cavity where that fetus will be found. Now, what happens when we go from five to six is this section basically moves inwards. So it pushes this way and eventually we form an embryo that looks something like this. And notice that this entire structure here is that developing embryo. It's that developing fetus. So the red portion is the actual embryo along with this green portion and the blue portion, the red portion is basically that middle layer, it's that Messider.