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Lower extremity muscle function and innervation 1

Topic: Pharmacology

Created on Monday, September 18 2006 by

Last modified on Monday, September 18 2006.




A patient presents with a weakness of hip extension. Which of the following spinal root segments represents the minimum lesion required to cause this deficit?

 
        A) L1 and L2
 
        B) L5 and S1
 
        C) S1 and S2
 
        D) L4
 
        E) L3 and L4
 

 


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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) L1 and L2

This answer is incorrect.


L1 and L2 are the spinal segments which most strongly affect hip flexion.  (See References)

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B) L5 and S1

This answer is correct.


Hip extension is most strongly affected by the L5 and S1 spinal segments.  (See References)

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C) S1 and S2

This answer is incorrect.


S1 and S2 are the spinal segments which most strongly affect ankle plantarflexion.  (See References)

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D) L4

This answer is incorrect.


L4 is the spinal segment which most strongly affects ankle dorsiflexion.  (See References)

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E) L3 and L4

This answer is incorrect.


L3 and L4 are the spinal segments which most strongly affect knee extension.  (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 1
Question ID: 69181
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 09/18/2006
Modified: 09/18/2006
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