So let's take a look at the following six diagrams that ultimately describe the process of gastrelation. The formation of the three distinct germ layers. So let's begin with diagram one which describes the process of implantation. When that blastocyst, the embryo actually develop, actually implants itself onto the endometrium, the lining of the uterus. So this is the endometrium, and this is the blastocyst. So recall that the blastocyst consists of a region known as the Trophy Blast.