Is There a Top and Bottom to This Tube?

Inplants, implants into the uterus and starts to divide. So that' about one week into it. It's already divides, just growing. Now it's all divided. Ak, you have cells differentiating into those cells that become the placente and those that become the embryo. And then what happens is, so thet the is there a top and bottom to this tube? Well, is thit? M, they usually call it cranial and caudal. One i close o the head, and one further away. At both ends of this tube open, yes. Where it first closes is probably in the servical region,. which woud be kind of your