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Innervation of muscles of the upper extremity

Topic: Anatomy

Created on Wednesday, August 9 2006 by

Last modified on Wednesday, December 31 1969.

Which of the following muscles is innervated by the ulnar nerve?

 
        A) Lumbricals III
 
        B) Opponens pollicis
 
        C) Lumbricals I
 
        D) Rhomboids
 
        E) Pectoralis major
 

 


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This question was created on August 09, 2006 by .
This question was last modified on December 31, 1969.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) lumbricals III

This answer is correct.


Lumbricals III is innervated by the ulnar nerve  (See References)

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B) opponens pollicis

This answer is incorrect.


Opponens pollicis is innervated by the median nerve  (See References)

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C) lumbricals I

This answer is incorrect.


Lumbricals I is innervated by the median nerve  (See References)

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D) rhomboids

This answer is incorrect.


Rhomboids is innervated by the dorsal scapular nerve, which arises from the root of C5 in the brachial plexus  (See References)

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E) pectoralis major

This answer is incorrect.


Pectoralis major is innervated by the medial and lateral pectoral nerves, which arise from the brachial plexus  (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.
2. Moore, K.L. (1992). Clinical Oriented Anatomy, 3rd Edition. Williams & Wilkins, Baltimore.
3. Preston, D.C., and Shapiro, B.E. (2005). Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, 2nd Edition. Elsevier, Philadelphia.
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anatomy
Innervation of muscles of the upper extremity
Question ID: 12270602
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 08/09/2006
Modified: 12/31/1969
Estimated Permutations: 90619200

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