Development Animation - Week 1

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Embryology - 15 Jun 2024    Facebook link Pinterest link Twitter link  Expand to Translate  
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Animation summarising early development in the first week following fertilization

  • The conceptus proceeds through embryonic cell cycle rounds of mitosis still enclosed within the zona pellucida. Progressing from a zygote, to blastomeres, then to a morula and finally to a blastocyst.
  • The uterine tube epithelium consists of ciliated cells that are moving the secreted fluid towards the uterine body. The conceptus is floating "boat-like" within this fluid and moved in the same direction.
  • Towards the end of the first week the blastocyst has reached the uterine body and from about day 5 onwards, the blastocyst "hatches" from the surrounding zona pellucida.
  • The conceptus can now receive nutrition directly and can commence the process of implantation in week 2.