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Lower extremity muscle function and innervation 2

Topic: Pharmacology

Created on Monday, September 18 2006 by

Last modified on Monday, September 18 2006.




A patient presents with weakness of the gastrocnemius and soleus. Which of the following spinal root segments represents the minimum lesion required to cause this deficit?

 
        A) L3 and L4
 
        B) L4
 
        C) L5 and S1
 
        D) S1 and S2
 
        E) S1
 

 


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This question was created on September 18, 2006 by .
This question was last modified on September 18, 2006.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) L3 and L4

This answer is incorrect.


The S1 and S2 spinal segments are the segments which most strongly innervate the gastrocnemius and soleus.  (See References)

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B) L4

This answer is incorrect.


The S1 and S2 spinal segments are the segments which most strongly innervate the gastrocnemius and soleus.  (See References)

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C) L5 and S1

This answer is incorrect.


The S1 and S2 spinal segments are the segments which most strongly innervate the gastrocnemius and soleus.  (See References)

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D) S1 and S2

This answer is correct.


The gastrocnemius and soleus are most strongly affected by the S1 and S2 spinal segments.  (See References)

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E) S1

This answer is incorrect.


The S1 and S2 spinal segments are the segments which most strongly innervate the gastrocnemius and soleus.  (See References)

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References:

1. Guarantors of Brain. (2000). Aids to the Examination of the Peripheral Nervous System, fourth edition. W.B. Saunders, Edinburgh.
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pharmacology
Lower extremity muscle function and innervation 2
Question ID: 69182
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 09/18/2006
Modified: 09/18/2006
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