In the final analysis, human form and function are the end-product of successful embryonic development, which begins with syngamy (Gr., syn = together; gamos = marriage)—the physical union of male and female germ cells or gametes. Stringent parameters of time, place, and manner exist for the initiation of pregnancy, including a narrowly scripted program of hormonal support for the attainment of a uterine receptive state following conception.
KeywordsInner Cell Mass Fetal Membrane Primitive Streak Amniotic Cavity Female Germ Cell
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