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26 Cards in this Set
- Front
- Back
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What component of anchoring villi anchors the chorion to the decidua?
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cytotrophoblasts
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What helps to facilitate transit of maternal blood components to fetus?
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microvilli on synctiontrophoblasts (increases surface area)
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what composes the placenta proper?
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decidua basalis and chorion frondosum
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boundaries of each cotyledon:
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chorionic plate
decidual plate decidual septa |
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which antibody CANNOT be passed by the placenta to the fetus?
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can't pass IgM, so passes IgG which is memory
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what do cytotrophoblasts make in order for fetus/mom not to "reject" each other immunologically?
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HLA-G
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what portion secretes beta HCG?
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syncitiotrophoblasts
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what does the umbilical cord contain?
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yolk sac
intercoelomic canal connecting stalk -2A -1V -1 allantois |
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What is the significance of the intercoelomic canal?
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that's where the guts herniate into
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what is the umblical cord composed of?
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amniotic membrane
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what surrounds the umbilical vessels?
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wharton's jelly-protects vessels from kinking or compression
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what's a normal length for the umbilical cord?
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1.5 times the length of fetus
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what keeps umbilical knots from causing ischemia in utero?
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in utero, vessels are surrounded by wharton's jelly so they don't get compressed and ischemic. once baby comes out, knots can cause a problem
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why are short umbilical cords a problem?
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show limited fetal movement: nuerological or developmental problem?
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what's wrong with a vilamentous insertion?
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umbilical cord inserts on the periphery of the placenta, in the membrane. thus, vessels are no longer surrounded by wharton's jelly, but are free in the membrane and can be compressed or hurt.
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amniotic bands are a result of poly or oligo hydramnios?
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result of oligohydramnios. damage to amnion, tries to heal itself and baby gets incorporated into the scar
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you find a small yellow calcified nodule on the placenta surface post delivery, what is this?
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remnanat of the yolk sac
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you find a zygote that is diandrogenic YY..
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complete hyatidiform mole: placenta but no fetus
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incomplete hyatidiform mole: triploid
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XYY: fetus, and lots of placenta
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what would the b hcg levels be in a person with a hyatidiform mole?
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super high!
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what causes a hyatidiform mole?
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two sperms entering an oocyte without a nucleus
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splitting during early morula phase (2-4cell stage)
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didi
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zygotic splitting during inner cell mass formation (blastocyst)
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diamnionic, monochorionic
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splitting during germ disc stage
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share everything
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splitting during gastrulation
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conjoined twins
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dual primitive streaks
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conjioned twins
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