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Extraocular muscles

Topic: Anatomy

Created on Tuesday, July 11 2006 by

Last modified on Wednesday, December 31 1969.

A 57 year-old male botanist visits you in the abandoned mine shaft, complaining of diplopia.
You note that most of the time that he is facing you and talking, he sits with his chin turned toward his right shoulder and his right eye abducted.
Based on this information alone, you suspect that there may be a paresis of which extraocular muscle?

A) Left lateral rectus

B) Right medial rectus

C) Left medial rectus

D) Left oblique rectus

E) Right superior rectus

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This question was created on July 11, 2006 by .
This question was last modified on December 31, 1969.

ANSWERS AND EXPLANATIONS

A) left lateral rectus

This answer is incorrect.

This presentation is typical of a paresis of the left medial rectus. A patient with a paresis of the left lateral rectus muscle will have impaired adbuction of the left eye, and is likely to try to minimize his diplopia by looking at the world with his chin turned toward his left shoulder and his right eye adducted. (See References)


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B) right medial rectus

This answer is incorrect.

This presentation is typical of a paresis of the left medial rectus. A patient with a paresis of the right medial rectus muscle will have impaired adduction of the right eye, and is likely to try to minimize his diplopia by looking at the world with his chin turned toward his left shoulder and his left eye abducted. (See References)


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C) left medial rectus

This answer is correct.

This presentation is typical of a paresis of the left medial rectus. A patient with a paresis of the left medial rectus muscle will have impaired adduction of the left eye, and is likely to try to minimize his diplopia by looking at the world with his chin turned toward his right shoulder and his right eye abducted. (See References)


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D) left oblique rectus

This answer is incorrect.

This presentation is typical of a paresis of the left medial rectus. The left oblique rectus is not a real muscle. (See References)


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E) right superior rectus

This answer is incorrect.

This presentation is typical of a paresis of the left medial rectus. A patient with a paresis of the right superior rectus muscle will have impaired elevation and inward rotation of the right eye, and is likely to try to minimize his diplopia by looking at the world with his chin raised, with his head extended and tilted toward his left shouder. (See References)


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References:

1. Ross, R.T. (1999). How to Examine the Nervous System, 3rd Edition. Appleton & Lange, Stamford, Connecticut. Pp. 45-60


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anatomy
Extraocular muscles
Question ID: 0000003
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 07/11/2006
Modified: 12/31/1969
Estimated Permutations: 0