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Stem cells: science, policy, and ethics
Gerald D. Fischbach, Ruth L. Fischbach
Published in Volume 114, Issue 10
J Clin Invest. 2004; 114(10):1364–1370 doi:10.1172/JCI23549
This article Copyright © 2004, The American Society for Clinical Investigation
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Figure 1

From zygote to blastula: the early stages of human development. Shortly after fertilization, the zygote repeatedly divides to form a solid mass of cells known as the morula. Two to three days after fertilization, the morula enters into the uterine cavity and forms a hollow sphere: the blastocyst. The surface cells form the trophoblast and give rise to extraembryonic tissues, while the inner cell mass is the source of embryonic stem cells and ultimately gives rise to the embryo, following implantation in the uterine wall.

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