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Trunks 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 pronator quadratus muscle is innervated by which of the following trunks of the brachial plexus?

 
        A) Lower and middle trunks.
 
        B) Upper trunk only.
 
        C) Upper, lower, and middle trunks.
 
        D) Lower trunk only.
 
        E) Upper and middle trunks.
 

 


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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) Lower and middle trunks.

This answer is correct.


The pronator quadratus muscle receives innervation from the lower and middle trunks, but not from the upper trunk. Refer to the image below.

Courtesy of Wikimedia
  (See References)

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B) Upper trunk only.

This answer is incorrect.


The pronator quadratus muscle receives innervation from the lower and middle trunks, but not from the upper trunk.  (See References)

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C) Upper, lower, and middle trunks.

This answer is incorrect.


The pronator quadratus muscle receives innervation from the lower and middle trunks, but not from the upper trunk.  (See References)

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D) Lower trunk only.

This answer is incorrect.


The pronator quadratus muscle receives innervation from the lower and middle trunks, but not from the upper trunk.  (See References)

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E) Upper and middle trunks.

This answer is incorrect.


The pronator quadratus muscle receives innervation from the lower and middle trunks, but not from the upper trunk.  (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
Trunks of the brachial plexus and the muscles they innervate 01
Question ID: 09090801
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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