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Questions and Answers
What appears in the cephalic region during this stage of development?
What appears in the cephalic region during this stage of development?
- Buccopharyngeal membrane (correct)
- Chorionic plate
- Somatopleuric layer of extraembryonic mesoderm
- Primary villi
What is the size of the disc during this stage of development?
What is the size of the disc during this stage of development?
- 1 to 2 cm
- 0.5 to 1 cm
- 2 to 3 cm
- 0.1 to 0.2 cm (correct)
What is the function of the decidua reaction during this stage of development?
What is the function of the decidua reaction during this stage of development?
- Formation of the primary villi
- Proliferation of the cytotrophoblast cells
- Formation of the chorionic cavity
- Healing of the endometrial defect (correct)
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Study Notes
- Day 11-12: Trophoblastic lac and slow growth of bilaminar disc.
- Decidua reaction begins, endometrial cells become loaded with glycogen and lipids.
- Exocoelom is present.
- Day 13: Endometrial defect heals, trophoblast primary villi appear.
- Appearance of secondary yolk sac and chorionic cavity.
- Buccopharangeal membrane appears in cephalic region.
- Disc remains small (0.1 to 0.2 mm).
- Cells of cytotrophoblast proliferate and penetrate syncytiotrophoblast.
- Cellular columns surrounded by syncytium form.
- Appearance of chorionic plate made up of trophoblast and somatopleuric layer of extraembryonic mesoderm.
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