NBME Form 2 Question

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NBME Form 2 Question

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cpg17
Forum Newbie

Topics: 4
Posts: 10

08/25/07 - 08:27 PM

A 48 year old man comes to his physician b/c his wife noticed that his right pupil is small. Physical examination shows that the right pupil is constricted and does not react to light. His left pupil is normal. These findings are most likely due to a lesion involving which of the following structures on the right.

a. cervical spinal cord
b. frontal eye fields
c. lateral geniculate nucleus
d. optic tract
e. visual cortex

The source I have gives the answer as D. A little confused why? Wouldnt damaging the optic tract affect both eyes b/c of neurons that cross at the optic chiasm? Thanks!!

yuna
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Topics: 7
Posts: 229

08/25/07 - 08:39 PM

Hi. you can recheck by the following

OOPs, sorry, I checked and I know that I got it wrong in my exam, poor me!

Edited by yuna on 08/25/07 - 09:07 PM

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new_n_lost
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08/25/07 - 08:48 PM

Nope the Answer is definitely A cos the Constriction of the Eye and not the Other is Definitely Horners

Causes for Miosis of one eye, but not the other
Iritis
Cervical sympathetic paralysis
Miotic drug (e.g. Pilocarpine)

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new_n_lost
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08/25/07 - 08:48 PM

Yuna............ Plz can u resize this pic cos its kinda distorting the thread.

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new_n_lost
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08/25/07 - 09:10 PM

yuna wrote:
Hi. you can recheck by the following

OOPs, sorry, I checked and I know that I got it wrong in my exam, poor me!

Hey Can U Repost the Pic cos it was a good one just resize it it was toolarge. That pic is the best one cos it explains all the important points which r concerned with the Visual Pathways.

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