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NBME 21 Answers

nbme21/Block 3/Question#40 (37.6 difficulty score)
A 65-year-old woman undergoes surgical repair ...
Area labeled β€˜A’ (Cranial nerve 3)πŸ”
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 +7 
submitted by hayayah(1052),
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o:etN hTe auscdenb .n is yultlcaa the rneev omst ykeill ot eb madaedg yb an gienpdanx nalnerti icaortd uemrnays ni the vucrnoase isusn tub hyet gvie uyo ficepsic 3NC ftnnuico ni tihs sonqiu.te

hungrybox  One pupil larger than the other indicates damage to the pupillary light reflex - afferent: CN II, efferent: CN III. +19  
cienfuegos  A little more info regarding other sxs (via UW): -cavernous carotid aneurysm: small usually asx, enlargement can cause u/l throbbing HA &/or CN deficits. VI most common thus ipsilateral lateral rectus weakness, can cause esotropia = inward eye deviation & horizontal diplopia worse when looking toward lesion -can also damage III, IV and V1/2 -can occasionally compress optic nerve or chiasm thus ipsilateral monoocular vision loss or non-specific visual acuity decrease +2  
lovebug  There are in FA2019, page 530. +  



 +6 
submitted by sympathetikey(1227),
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Godo c:utipre /-tththsn/ouaahr.wp/eiyf/mCetaetncCn-eo-utomgpinleea.oo-vsotnncnjutpst/pnssSd:aof-




 +1 
submitted by docshrek(5),
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ntisQoue etms y:ass EP wssho tgiRh uppli si lergra athn the eftl lpup.i (:Nteo tI is otn lgthi xreefl). Adn seskanwe iwht mvotmnee fo eye th(at amsen stom eomes)v.tnm

CN III alspy - iomp,glhlaapetO Pissot, rsadiMsiy dan sslo fo mod.tancamooci oPtsis, syMdisiar nda ssol of omnimoaodactc are edu ot - rapcsiamythPesat etlvra odstieu of NC .III oS mero elkyil CN III is degdaam nad tno ohtesr in the rosaeuvcn uni.ss




 +0 
submitted by dr.xx(141),
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oteirv.s_iCisnppowistgds/e.k:/uirnnihk/ea/uwa




 +0 
submitted by azibird(154),

What if you know it's CNIII and remember CN's III, IV, V1, V2, and VI all run through the cavernous sinus, but don't remember which is which in the picture?

CN's IV and VI only control one muscle each and are therefore very small in diameter. V1 and V2 serve a lot of functions and are therefore large. III is intermediate.

Also they are organized in an ascending manner - III above IV above V1 above V2, and VI to the side.