NBME 23 Area labeled ‘C’ (Cranial nerve 8: vestibulocochlear) (NBME Answers)

Retired NBME 23 Answers

nbme23/Block 4/Question#50 (reveal difficulty score)
A 48-year-old man has complete loss of ...
Area labeled ‘C’ (Cranial nerve 8: vestibulocochlear) 🔍 / 📺 / 🌳 / 📖
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+34 upvote downvote
submitted by ∗seagull(1933)

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What a terrible picture. They they covered up part of it with lines. WTF

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sympathetikey Agreed. +18

catch-22 Start at the pontomedullary junction and count from superior to inferiorly (or medially to laterally): VI, VII, VIII, IX. +3

yotsubato I looked at the left side (cause the nerves arent frazzled up). Saw 7 and 8 come out together nicely. Then picked the right sided version of 8 +15

lolmedlol why is it not H or I on the right side; the stem says he has hearing loss on the right side, so the lesion should be ipsilateral no? +4

catch-22 You're looking at the ventral aspect of the brainstem. +11

catch-22 ^Also, you know it's the ventral aspect because you can see the medullary pyramids. +1

amarousis think of the belly of the pons as a pregnant lady. so you're looking at the front of her +6

hello which letter is CN IX in this diagram? +

miriamp3 there is no VI nerve. That's the thing. The VI nerve should be in the angle between the pons and the medulla. Parallel to the pyramid. It goes V then VII and then VIII. I make the same mistake and I thought it was the picture but there is no VI par in the photo. They know We count from superior to inferior. +

jesusisking Don't G and H lowkey look like VII and VIII? I chose H b/c of that +

ljennetten G and H are CN VII and VIII on the left side, while this guy has right sided hearing loss. CN VI is not labeled in this photo, but is the smaller nerve that arises medial to CN VII and us cut most of the way up the pons. +1

prolific_pygophilic Mother Fuckers took this with a disposal camera then deep fried it. What is this grainy ass picture +1

soccerfan23 There's over a million pics of the brainstem on the internet and of course, the NBME picked the worst quality, most blurry one for this Q. +

+12 upvote downvote
submitted by ∗isaacyo94(13)

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I actually think I found the exact same image in color and fully labeled... and VIII is labeled as C here... https://d1yboe6750e2cu.cloudfront.net/i/c8494948ed5e0460ae33c5ecb6be887208f9d8c1

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makingstrides If they have one in color, and these exams are online, how come they don't just put the color ? +

+3 upvote downvote
submitted by ∗abhishek021196(119)

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http://what-when-how.com/wp-content/uploads/2012/04/tmp15F28.jpg

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+1 upvote downvote
submitted by 123ojm(11)

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Which structure is letter F pointing to in the diagram?

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andro Cerebral Peduncles +2

+0 upvote downvote
submitted by ∗hello(429)

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which letter is CN IX in this diagram?

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titanesxvi A think is D, but it is not very clear +2

usmlecharserssss A WHAT anatomical structure is this ???????? +

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