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The Endowment for Human Development
The Endowment for Human Development
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The Embryonic Period


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: Durant les primeres 8 setmanes després de la fecundació, l'ésser que s'està desenvolupant rep el nom d'embrió, que vol dir que "creix a l'interior". Aquesta etapa, anomenada període embrionari, es caracteritza per la formació dels principals sistemes del cos.

All ages referenced to fertilization, not last menstrual period.
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