:Note hTe bcasdune .n si taclalyu eht erven omts lkiley to be admgade by na deinanpxg einantlr acodrti nreamyus ni hte ancersvou inuss tub eyth veig uyo ifpecsci CN3 ntinocuf in sith q.ouintse
Question stem says: PE shows Right pupil is larger than the left pupil. (Note: It is not light reflex). And weakness with movement of eye (that means most movements).
CN III palsy - Opthalmoplegia, Ptosis, Mydriasis and loss of accommodation. Ptosis, Mydriasis and loss of accommodation are due to - Parasympathetics travel outside of CN III. So more likely CN III is damaged and not others in the cavernous sinus.
Seuctstrur tiinwh eth eoutr (a)raeltl lalw fo eth raomtpetmcn fomr eirsourp to finr otoorul:morOeci oe lvecrnTherra eOr mnplihacvhte nad mlaxyiral rcaehbsn of teh igetnmairl rsvrcSnu uterete gnispas uhhrtgo the ilnmeid lm(ad)ei bn:caldu eslwA raIn lerenvent oicdatr eytrar iocmpnaacde by eth tneranlI aocdirt xpelsu
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.