Eye fixed downward and outward, what cranial nerve? - USMLE Forums
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Old 09-13-2011
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Eye Eye fixed downward and outward, what cranial nerve?

On examination, a patientís right eye is fixed in a downward and outward position. In addition, the pupil is fixed and dilated. This person has a palsy of which cranial nerve?
A. CN IV
B. CN V
C. CN VI
D. CN III
E. CN VII
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Old 09-13-2011
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A. CN IV superior oblique
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  #3  
Old 09-13-2011
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Cranial Nerve 3
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Old 09-13-2011
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A complete Oculomotor nerve palsy will result in a characteristic down and out position in the affected eye.

http://en.wikipedia.org/wiki/Oculomotor_nerve_palsy
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Old 09-13-2011
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D. CN III is the answer
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  #6  
Old 09-13-2011
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Yeah, its III


Some art:

.................Superior III
////////////////////\
.........................| Sup + Med. III
.........................|/
Lateral VI <----( o )-----> Medial III
////////////////////|\
.............,...........| Inf + Medial IV
................,.......\/
..................Inferior III
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  #7  
Old 09-14-2011
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D. Cranial nerve III
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Old 09-14-2011
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D. Cranial nerve 3
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Old 09-16-2011
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Cranial nerve 3
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