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The document summarizes key stages in human embryological development from fertilization through early organ formation and placentation. It describes the development of the blastocyst and implantation around days 5-8. Gastrulation begins around day 14 with the formation of the three germ layers and primitive streak. By day 20, somites have formed from paraxial mesoderm. Placentation establishes the maternal-fetal interface for gas/nutrient exchange and waste removal. Typical gestation is about 9 months from

Author

Arwa

Language

EN