Embryonic+stage

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= Definition: = The second stage of prenatal development, from week 2 through week 8, during which the embryo's organ systems form.HGD,Chapter 3 pp.61

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=In the News:= Critical stage of embryonic development now observable The research, from the laboratory of Professor Magdalena Zernicka-Goetz of the University of Cambridge, enables scientists to view critical aspects of embryonic development which was previously unobservable. For several decades it has been possible to culture embryos from a single cell, the fertilised egg, to the blastocyst, a ball of some 64 cells all derived from the first by repeated rounds of cell division. In practical terms this has allowed the development of the in vitro fertilisation techniques that are used world-wide to assist fertility.

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