File:Embryo_7_weeks_after_conception.jpg · Wikimedia Commons · See Wikimedia Commons
An embryo is the earliest stage of development in a multicellular organism, beginning right after a sperm cell fertilizes an egg cell in sexually reproducing species. The fertilized egg then divides repeatedly, eventually forming a structured ball of cells with a fluid-filled cavity, which marks the transition into more complex development.
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Key facts
- Embryology.Name
- Embryo
- Embryology.Image
- Embryo 7 weeks after conception.jpg
- Embryology.Caption
- A human embryo seven weeks after conception (nine weeks gestational age)
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Wikidata facts
- Followed by
- juvenile fish
- Follows
- zygote
- Image
- Эмбрион человека 2-е сутки развития.jpg
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- Commons category
- Embryos
- location of creation
- egg
- on focus list of Wikimedia project
- Wikipedia:Vital articles/Level/4
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Article · Français
Un embryon (du grec ancien ἔμϐρυον / émbruon) est un organisme en développement depuis la première division de l'œuf ou zygote jusqu'au stade où les principaux organes sont formés. L'embryologie est l'étude de la croissance d'un organisme durant toute la gestation, c'est-à-dire à la fois pendant la période embryonnaire et la période fœtale.
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