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Extraocular muscles

Topic: Anatomy

Created on Tuesday, July 11 2006 by

Last modified on Thursday, January 1 1970.

A 48 year-old male tick rancher visits you in your clinic, complaining of diplopia.
You note that most of the time that he is facing you and talking, he sits with his chin raised, with his head extended and tilted toward his right shouder.
Based on this information alone, you suspect that there may be a paresis of which extraocular muscle?

A) Left lateral rectus

B) Left superior rectus

C) Right superior rectus

D) Right oblique rectus

E) Right lateral rectus

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This question was created on July 11, 2006 by .
This question was last modified on January 01, 1970.

ANSWERS AND EXPLANATIONS

A) left lateral rectus

This answer is incorrect.

This presentation is typical of a paresis of the left superior 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) left superior rectus

This answer is correct.

This presentation is typical of a paresis of the left superior rectus. A patient with a paresis of the left superior rectus muscle will have impaired elevation and inward rotation of the left 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 right shouder. (See References)


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C) right superior rectus

This answer is incorrect.

This presentation is typical of a paresis of the left superior 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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D) right oblique rectus

This answer is incorrect.

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


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E) right lateral rectus

This answer is incorrect.

This presentation is typical of a paresis of the left superior rectus. A patient with a paresis of the right lateral rectus muscle will have impaired adbuction of the right 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 left eye adducted. (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: 01/01/1970
Estimated Permutations: 0