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Questions and Answers
Which structure appears on Day 13 as a small cavity within the exocoelomic cavity?
Which structure appears on Day 13 as a small cavity within the exocoelomic cavity?
- Buccopharyngeal membrane
- Secondary yolk sac (correct)
- Chorionic cavity
- Primary yolk sac
What is the size of the bilaminar disc on Day 11-12 compared to the trophoblast?
What is the size of the bilaminar disc on Day 11-12 compared to the trophoblast?
- It remains the same size as the trophoblast
- It is larger than the trophoblast
- It grows slowly compared to the trophoblast (correct)
- It grows faster than the trophoblast
What are the trophoblast primary villi formed by on Day 13?
What are the trophoblast primary villi formed by on Day 13?
- Syncytiotrophoblast cells surrounding cytotrophoblast
- Cytotrophoblast cells surrounding syncytiotrophoblast (correct)
- Extraembryonic mesoderm cells surrounding trophoblast
- Hypoblastic cells surrounding epiblastic cells
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Study Notes
- Day 11-12: Bilaminar disc grows slowly compared to trophoblast, remains small.
- Day 11-12: Decidua reaction begins, endometrial cells become glycogen and lipid-loaded, tissue is edematous.
- Day 13: Endometrial defect at implantation site completely heals.
- Day 13: Trophoblast primary villi appear, formed by cytotrophoblast cells penetrating syncytiotrophoblast.
- Day 13: Secondary yolk sac appears as small cavity within exocoelomic cavity.
- Day 13: Chorionic cavity and chorionic plate appear, formed by trophoblast and somatopleuric layer of extraembryonic mesoderm.
- Day 13: Buccopharyngeal membrane appears as slight thickening of hypoblastic disc at cephalic region.
- Bilaminar disc remains very small, measuring 0.1 to 0.2 mm.
- Decidua reaction initially confined to implantation site but soon occurs throughout endometrium.
- Trophoblast primary villi form cellular columns surrounded by syncytium.
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