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NBME 22 Answers

nbme22/Block 4/Question#50 (39.0 difficulty score)
A 31-year-old woman in the second trimester ...
Hematopoietic stem cells🔍

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submitted by keyseph(29),

Just my two cents: Cytotrophoblast, primary stem villus, syncytiotrophoblast, and trophoblastic lacunae are all components of the developing placenta, which supplies the fetus in utero. These structures are all derived from the trophoblast, which is considered extra-embryonic tissue. "Hematopoietic stem cells" is the only answer choice that would indicate fetal parts were formed.

submitted by seagull(1170),
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iTsh si na mclniteeop itadrofdhiym o.lme yhTe tnaocin epnitclmoe etfla srtap dungliinc mset sellc iwchh are ortsyim adn veig eisr ot urcnreuutdst

kard  Can someone explain why the other choices are incorrect?, Thanks +  
mtkilimanjaro  I got it wrong and put the lacunae one, I wasnt sure if hematopoietic stem cells could occur from the mother as well. If it had any other cell line i wouldve picked it. For the others: this lady has a partial mole, which has fetal parts. A complete mole has NO fetal parts. Both mole types have cyto, syncytio, and villi. Thats how I ruled those ones out +2  

submitted by nwinkelmann(265),
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