So that includes the gonads of the female, the ovaries, as well as the gonads of the male, the testes. So these are the three different layers that are formed during the process of gastrelation. The question is, how does gastrolation actually take place? 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.