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Roots of the brachial plexus and the muscles they innervate 01

Topic: Pharmacology

Created on Tuesday, September 9 2008 by jdmiles

Last modified on Tuesday, September 9 2008.

Which of the following roots provide innervation to the extensor pollicis longus?

 
        A) C5 and C6
 
        B) C5, C6, and C7
 
        C) C4 and C5
 
        D) C3, C4, and C5
 
        E) C7 and C8
 

 


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This question was created on September 09, 2008 by jdmiles.
This question was last modified on September 09, 2008.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) C5 and C6

This answer is incorrect.


Extensor pollicis longus receives innervation from the C7 and C8 roots. C7 provides the most significant portion of the innervation.  (See References)

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B) C5, C6, and C7

This answer is incorrect.


Extensor pollicis longus receives innervation from the C7 and C8 roots. C7 provides the most significant portion of the innervation.  (See References)

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C) C4 and C5

This answer is incorrect.


Extensor pollicis longus receives innervation from the C7 and C8 roots. C7 provides the most significant portion of the innervation.  (See References)

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D) C3, C4, and C5

This answer is incorrect.


Extensor pollicis longus receives innervation from the C7 and C8 roots. C7 provides the most significant portion of the innervation.  (See References)

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E) C7 and C8

This answer is correct.


Extensor pollicis longus receives innervation from the C7 and C8 roots. C7 provides the most significant portion of the innervation.  (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. (ISBN:0702025127)Advertising:
2. Preston, D.C., and Shapiro, B.E. (2005). Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, 2nd Edition. Elsevier, Philadelphia. (ISBN:075067492X)Advertising:
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pharmacology
Roots of the brachial plexus and the muscles they innervate 01
Question ID: 09090804
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 09/09/2008
Modified: 09/09/2008
Estimated Permutations: 0

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