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Unformatted text preview: Embryonic (embryo; 3 rd week -8 th week) 20% of all embryos are spontaneously aborted neural tube developed (CNS) 4 th week head, facial features, and first signs of cardiovascular functioning 8 th week all basic organs have formed, except sex organs Fetal (fetus; 9 th week-birth) Sex organs developed, SRY signal sent to males Fetus is fully shaped by the 12 th week. 3-6 months development working harder working beter. Age of viability ` 22 weeks...
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- Spring '08