3 Questions
Which layer forms the lining of the primitive yolk sac?
Hypoblast
What closes the penetration defect in the surface epithelium?
Fibrin coagulum
What is the stage of development when the blastocyst is completely embedded in endometrial stroma?
Lacunar stage
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.
Test your knowledge of embryonic development with this quiz! From the formation of the hypoblast and epiblast layers to the appearance of the amniotic cavity and lacunar stage, this quiz covers all the key stages of early embryonic development. Challenge yourself to remember the details of the formation of the exocoelomic membrane and primitive yolk sac, as well as the blastocyst's embedding in the endometrium. Brush up on your embryology knowledge and see how much you
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