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NBME 20 Answers

nbme20/Block 3/Question#7 (31.8 difficulty score)
A 10-year-old boy has a palpable mass in the ...
Endoderm of foramen caecumπŸ”
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 +7 
submitted by xxabi(248),
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hsiT is a hasyosllogtr tdcu yts.c ehT goaylsrlsto tudc aym eristps dan lrtseu in a ralhsltyoosg ctdu ytsc rcurigcon( ni ienmdli nera dhyoi nbeo or ta eth seab fo eht ,nguote) htsu lwil aclasylcils meov up hiwt llgnaiwswo ro otgneu r.psiotrnou

The fmnaero ecumc (fo the oen)ugt is hte olarnm nteranm of het groalolsshty cudt

lilyo  I got it wrong though because the question clearly asks what does this structure (thyroglossal duct) DEVELOP from, not this structure eventually develops to form which structure. If it asked that then I would have picked option A but because it didnt that was the first option I crossed out. +15  
misterdoctor69  It was a poorly worded question no doubt. But when they say "endoderm of foramen cecum" they're referring to the endoderm which is a primitive structure. The "foramen cecum" part is just a modifier that is added to describe what that endoderm would eventually become. +  
lovebug  FA 2019, page 322page! +  



 +2 
submitted by hungrybox(963),

The endoderm of the 3rd and 4th pouches form the parathyroid gland and the parafollicular cells of the thyroid gland.