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14 Cards in this Set
- Front
- Back
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When does the chorion form?
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Day 3
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When does the amnion form?
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Day 8
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At what point is there a risk of conjoined twinning?
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If zygote separates after day 8 (after the formation of the amnion)
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What/where is the cytotrophoblast?
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It is the inner layer of cells of the chorionic villi; makes cells
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What/where is the syncytiotrophoblast?
What does it do? |
It is the outer layer of cells of the chorionic villi; makes hCG (like LH) --> stimulates the corpus luteum to make progesterone during 1st trimester
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What/where is the decidua basalis?
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It is maternal cells derived from the endometrium that form a lacunae (filled with maternal blood) with the chorionic villi
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From what structure(s) do the umbilical arteries (2) drain?
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The internal iliac arteries
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From what structure are the umbilical arteries and veins derived?
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From the allantois
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How is the urachus formed?
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Yolk sac --> allantois --> allantois extends into urogenital sinus --> urachus, from bladder to yolk sac
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What are possible manifestations of a failure of the urachus to obliterate?
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Patent urachus (urine discharge from umbilicus)
Vesicourachal diverticulum (bladder outpouching) |
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When does the allantois form from the yolk sac?
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3rd week
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What connects the yolk sac to the midgut lumen?
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vitelline duct
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When does the vitelline duct (omphalomesenteric duct) obliterate?
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7th week
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What are the manifestations of a patent vitelline duct?
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Vitelline fistuala (meconium discharge from umbilicus)
Meckel's diverticulum |
