Zoe MCQ 19

Topic: Anatomy

Created on Saturday, November 26 2022 by zoe

Last modified on Saturday, November 26 2022.

 
        A) Homonymous inferior left quadrantanopsia
 
        B) Homonymous inferior right quadrantanopsia
 
        C) Homonymous superior right quadrantanopsia
 
        D) Homonymous superior left quadrantanopsia
 

 

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This question was created on November 26, 2022 by zoe.
This question was last modified on November 26, 2022.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) Homonymous inferior left quadrantanopsia

This answer is incorrect.

Fibers representing superior visual field quadrants loop out into the temporal lobe (Meyer's loop) before turning posteriorly. Therefore, damage to the temporal lobe can cause "pie in the sky" or superior left or right vision loss, and in this case, since it is on the right temporal lobe, this corresponds to a left-sided vision loss of both eyes: Homonymous superior left quadrantanopsia  (See References)

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B) Homonymous inferior right quadrantanopsia

This answer is incorrect.

Fibers representing superior visual field quadrants loop out into the temporal lobe (Meyer's loop) before turning posteriorly. Therefore, damage to the temporal lobe can cause "pie in the sky" or superior left or right vision loss, and in this case, since it is on the right temporal lobe, this corresponds to a left-sided vision loss of both eyes: Homonymous superior left quadrantanopsia  (See References)

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C) Homonymous superior right quadrantanopsia

This answer is incorrect.

The patient has a lesion of the right temporal lobe which will correspond to the left visual fields.   (See References)

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D) Homonymous superior left quadrantanopsia

This answer is correct.

Fibers arising from the LGN curve around the lateral wall of the lateral ventricle as the optic radiation (also called geniculocalcarine fibers). Not all of these fibers pass directly backward to the occipital lobe. Fibers representing superior visual field quadrants loop out into the temporal lobe (Meyer's loop) before turning posteriorly. Therefore, damage to the temporal lobe can cause "pie in the sky" or superior left or right vision loss, and in this case, since it is on the right temporal lobe, this corresponds to a left-sided vision loss of both eyes: Homonymous superior left quadrantanopsia   (See References)

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References:

1. Nolte Chapter 17: Page 421

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anatomy
Zoe MCQ 19
Question ID: 112622091
Question written by zoe. (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 11/26/2022
Modified: 11/26/2022
Estimated Permutations: 24