Embryonic Development: 8th Day
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Questions and Answers

During the 9th to 10th days of development, which structure forms a membrane known as exocoelomic membrane or Heuser’s membrane?

  • Hypoblast cells (correct)
  • Endometrial stroma
  • Trophoblastic lacunae
  • Syncytium vacuoles

    • What role does the extraembryonic mesoderm play during the 11th to 12th days of development?

  • Forms the lining of the exocoelomic cavity (correct)
  • Creates the trophoblastic lacunae
  • Contributes to the formation of endometrial stroma
  • Develops into the syncytium vacuoles

    • What characterizes the trophoblast during the 11th to 12th days of development?

  • Formation of large syncytial lacunae in the ab-embryonic pole
  • Conversion into embryonic mesoderm
  • Complete absence of lacunar spaces
  • Continued presence of cytotrophoblastic cells in the ab-embryonic pole (correct)

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