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Questions and Answers
Which layer forms the lining of the primitive yolk sac?
Which layer forms the lining of the primitive yolk sac?
- Epiblast
- Exocoelomic membrane
- Hypoblast (correct)
- Syncytium
What closes the penetration defect in the surface epithelium?
What closes the penetration defect in the surface epithelium?
- Fibrin coagulum (correct)
- Amniotic cavity
- Primitive yolk sac
- Lacunae
What is the stage of development when the blastocyst is completely embedded in endometrial stroma?
What is the stage of development when the blastocyst is completely embedded in endometrial stroma?
- Hypoblast stage
- Exocoelomic stage
- Amniotic stage
- Lacunar stage (correct)
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Study Notes
- Development of two layers within the inner cell mass: hypoblast and epiblast.
- Appearance of amniotic cavity within epiblast.
- Development of vacuoles in syncytium at embryonic pole forming large lacunae.
- Formation of exocoelomic membrane and primitive yolk sac.
- Blastocyst is deeply embedded in endometrium.
- Penetration defect in surface epithelium is closed by fibrin coagulum.
- Lacunar stage of development.
- Flattened cells from hypoblast form exocoelomic membrane.
- Hypoblast and exocoelomic membrane form lining of primitive yolk sac.
- Blastocyst is completely embedded in endometrial stroma.
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