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An inner layer of cells that is separated from an outer layer of cells by a fluid-filled cavity
The zygote divides rapidly, until it forms a ball of about 16 identical cells, which is then called a morula. The morula is then swept down the fallopian tube and into the uterus, a process that takes approximately 7 to 9 days. The lining of the uterus, or endometrium, has become rich in nutrients in preparation for the pregnancy. Just before the morula reaches the uterus, the cells begin to form layers—first an inner layer, then an outer layer that is around a fluid-filled space. This structure is called a blastocyst. As the structure continues to grow, the outer layer becomes the trophoblast, which will become the structures that nourish (the placenta) and protect the developing conceptus. The inner cell mass will become the embryo which will continue to grow and become the fetus.
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