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Depending on the species, the blastopore has been reported to become the mouth (protostomy), the anus (deuterostomy), both mouth and anus (amphistomy), or neither (i.e., the blastopore closes).
3. The blastocyst has an outer-layer of cells called the trophoblast, which will eventually form the protective placenta. Inside the trophoblast is a group of cells called the inner cell mass. The organism in a stage between zygote to fetus is called an embryo* and the cells are called embryonic stem cells.he blastocyst has an outer-layer of cells called the trophoblast, which will eventually form the protective placenta. Inside the trophoblast is a group of cells called the inner cell mass. The organism in a stage between zygote to fetus is called an embryo* and the cells are called embryonic stem cells.