We have this inner collection of cells found on one side known as the inner cell mass. And then we have this hollow cavity that contains a fluid that is used to basically provide the nutrition to these cells that the cells need to actually grow and develop. And this cavity is known as a blastoceal. Now, what exactly is the function of the inner cell mass and the trophy blast? Well, the trophy blast will eventually develop into the coriane and the placenta of the fetus, while the inner cell mass, these cells here, shown in light purple, will eventually develop into the actual organism, into the tissues, into the organs and the systems of that individual. Now, notice, everything we've discussed so far was actually before implantation took place.