Dillon MCQ 25

Topic: Anatomy

Created on Saturday, November 26 2022 by dillon

Last modified on Saturday, November 26 2022.

 
        A) Optic chiasm
 
        B) Edinger-Westphal nucleus
 
        C) MGN
 
        D) Left Meyer’s loop
 
        E) Right Meyer's loop
 
        F) Left occipital lobe
 
        G) Right occipital lobe
 
        H) Right optic nerve
 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) Optic chiasm

This answer is incorrect.

This would likely cause a Bitemporal hemianopsia (as seen in the mass effect from pituitary tumors)  (See References)

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B) Edinger-Westphal nucleus

This answer is incorrect.

This nucleus is contains the cells that are involved in innervating the ciliary muscle and the pupillary constrictor.  (See References)

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C) MGN

This answer is incorrect.

MGN is involved in audition, not vision.  (See References)

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D) Left Meyer’s loop

This answer is correct.

Fibers for the superior visual field loop out into the temporal lobe (aka, meyer's loop). These fibers carry information for the superior contralateral visual fields. Damage to the left Meyer's loop would result in superior right quadrantanopsia  (See References)

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E) Right Meyer's loop

This answer is incorrect.

Fibers for the superior visual field loop out into the temporal lobe (aka, meyer's loop). These fibers carry information for the superior contralateral visual fields. Damage to the right Meyer's loop would result in superior left quadrantanopsia  (See References)

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F) Left occipital lobe

This answer is incorrect.

Damage to the occipital lobe would cause a contralateral homonymous hemianopsia  (See References)

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G) Right occipital lobe

This answer is incorrect.

Damage to the occipital lobe would cause a contralateral homonymous hemianopsia  (See References)

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H) Right optic nerve

This answer is incorrect.

This would result in right monocular blindness.  (See References)

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References:

1. Vanderah, Todd W., and John Nolte. “Ch. 17 The Visual System” Nolte's Essentials of the Human Brain, Elsevier, Philadelphia, PA, 2019.

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anatomy
Dillon MCQ 25
Question ID: 112622061
Question written by dillon. (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 11/26/2022
Modified: 11/26/2022
Estimated Permutations: 40320