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Questions and Answers
What appears at the cephalic region of the embryo?
What appears at the cephalic region of the embryo?
- Chorionic cavity
- Buccopharyngeal membrane (correct)
- Trophoblastic lac
- Primitive exocoelom
What is the function of the trophoblast primary villi?
What is the function of the trophoblast primary villi?
- To cause the decidua reaction
- To form the chorionic cavity (correct)
- To form the exocoelom
- To heal the endometrial defect
What happens on Day 13 of development?
What happens on Day 13 of development?
- Endometrial defect at implantation site heals completely (correct)
- Hypoblastic disc is formed
- Exocoelom appears
- Bilaminar disc grows rapidly
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Study Notes
- Development on Day 11-12 involves trophoblastic lac and slow growth of bilaminar disc.
- Decidua reaction begins, causing endometrial cells to become glycogen and lipid-loaded.
- Exocoelom and primitive exocoelom appear.
- Endometrial defect at implantation site heals completely on Day 13.
- Trophoblast primary villi appear, formed from cytotrophoblast cells.
- Appearance of secondary yolk sac or definitive yolk sac.
- Chorionic cavity and chorionic plate appear.
- Buccopharyngeal membrane appears at cephalic region of embryo.
- Hypoblastic disc composed of columnar cells.
- Oropharyngeal membrane also appears.
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