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Cords 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.

The supinator muscle is innervated by which of the following cords of the brachial plexus?

 
        A) Medial, posterior, and lateral cords.
 
        B) Medial and lateral cords.
 
        C) Lateral cord only.
 
        D) Medial cord only.
 
        E) Posterior cord only.
 

 


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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) Medial, posterior, and lateral cords.

This answer is incorrect.


The supinator muscle receives innervation from the posterior cord only.  (See References)

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B) Medial and lateral cords.

This answer is incorrect.


The supinator muscle receives innervation from the posterior cord only.  (See References)

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C) Lateral cord only.

This answer is incorrect.


The supinator muscle receives innervation from the posterior cord only.  (See References)

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D) Medial cord only.

This answer is incorrect.


The supinator muscle receives innervation from the posterior cord only.  (See References)

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E) Posterior cord only.

This answer is correct.


The supinator muscle receives innervation from the posterior cord only. Refer to the image below.

Courtesy of Wikimedia
  (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
Cords of the brachial plexus and the muscles they innervate 01
Question ID: 09090802
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 09/09/2008
Modified: 09/09/2008
Estimated Permutations: 18720

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