The FrontalCortex question bank can help you study for the USMLE.

Extraocular muscles

Topic: Anatomy

Created on Tuesday, July 11 2006 by

Last modified on Wednesday, December 31 1969.

A 57 year-old male sunflower supplier visits you in the Emergency Department, 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 left shouder.
Based on this information alone, you suspect that there may be a paresis of which extraocular muscle?

A) Right lateral rectus

B) Right inferior oblique

C) Left superior oblique

D) Right superior rectus

E) Right superior oblique

	= Go back to the top of the page.
	= Reload a different version of this question ().
	= Load a random question from the database.
	= Use this question as a template to create a totally NEW question.
	= Enter detailed rating for this question!
	= How users like you have rated this question.

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

ANSWERS AND EXPLANATIONS

A) right lateral rectus

This answer is incorrect.

This presentation is typical of a paresis of the right 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)


Please log in if you want to rate questions.

B) right inferior oblique

This answer is incorrect.

This presentation is typical of a paresis of the right superior rectus. Paresis of the right inferior oblique muscle does not present in this way. (See References)


Please log in if you want to rate questions.

C) left superior oblique

This answer is incorrect.

This presentation is typical of a paresis of the right superior rectus. A patient with a paresis of the left superior oblique muscle will have impaired depression and inward rotation of the left eye, and is likely to try to minimize his diplopia by looking at the world with his chin held down and his head tilted and turned with his right ear held close to his right shoulder. (See References)


Please log in if you want to rate questions.

D) right superior rectus

This answer is correct.

This presentation is typical of a paresis of the right 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)


Please log in if you want to rate questions.

E) right superior oblique

This answer is incorrect.

This presentation is typical of a paresis of the right superior rectus. A patient with a paresis of the right superior oblique muscle will have impaired depression and inward rotation of the right eye, and is likely to try to minimize his diplopia by looking at the world with his chin held down and his head tilted and turned with his left ear held close to his left shoulder. (See References)


Please log in if you want to rate questions.

References:

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


Please log in if you want to rate questions.

FrontalCortex.com -- Neurology Review Questions -- Neurology Boards -- Board Review -- Residency Inservice Training Exam -- RITE Exam Review
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