FrontalCortex, Inc. is a non-profit corporation dedicated to neurology education.

Extraocular muscles

Topic: Anatomy

Created on Tuesday, July 11 2006 by

Last modified on Wednesday, December 31 1969.

A 54 year-old male potato farmer visits you in the Albuquerque Baloon Fiesta, complaining of diplopia.
You note that most of the time that he is facing you and talking, he sits with his chin held down with no extraordinary tilting of his head.
Based on this information alone, you suspect that there may be a paresis of which extraocular muscle?

A) Left lateral rectus

B) Left superior oblique

C) Right medial rectus

D) Right inferior oblique

E) Right inferior rectus

	= 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) left lateral rectus

This answer is incorrect.

This presentation is typical of a paresis of the right inferior 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)


Please log in if you want to rate questions.

B) left superior oblique

This answer is incorrect.

This presentation is typical of a paresis of the right inferior 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.

C) right medial rectus

This answer is incorrect.

This presentation is typical of a paresis of the right inferior 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)


Please log in if you want to rate questions.

D) right inferior oblique

This answer is incorrect.

This presentation is typical of a paresis of the right inferior 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.

E) right inferior rectus

This answer is correct.

This presentation is typical of a paresis of the right inferior rectus. A patient with a paresis of the right inferior rectus muscle will have impaired depression and outward rotation of the right eye, and is likely to try to minimize his diplopia by looking at the world with his chin held down with no extraordinary tilting of his head. (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