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.

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

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A) Lateral cord only.

This answer is incorrect.

The extensor pollicis brevis muscle receives innervation from the posterior cord only.  (See References)

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B) Medial and lateral cords.

This answer is incorrect.

The extensor pollicis brevis muscle receives innervation from the posterior cord only.  (See References)

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C) Medial cord only.

This answer is incorrect.

The extensor pollicis brevis muscle receives innervation from the posterior cord only.  (See References)

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D) Medial, posterior, and lateral cords.

This answer is incorrect.

The extensor pollicis brevis muscle receives innervation from the posterior cord only.  (See References)

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E) Posterior cord only.

This answer is correct.

The extensor pollicis brevis muscle receives innervation from the posterior cord only. Refer to the image below.
  (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