Human Embryonic and Fetal Development
Three-dimensional visualization reconstructed from scanned human data of a 8 cell zygote, a 14-16 day old embryo, a 44 day old embryo, and a 9 week old fetus. The body does not increase greatly in size during the embryonic period. But during the the fetal period, beginning at week nine, a phase of rapid growth starts that continues until after birth.
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