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Upper extremity muscle function and innervation 01

Topic: Anatomy

Created on Thursday, July 31 2008 by jdmiles

Last modified on Thursday, July 31 2008.

Of the following choices, which muscle receives the most proximal innervation from the median nerve?

 
        A) Pronator teres
 
        B) Opponens pollicis
 
        C) Extensor carpi radialis longus
 
        D) Flexor digitorum profundus
 
        E) Flexor pollicis longus
 

 


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This question was created on July 31, 2008 by jdmiles.
This question was last modified on July 31, 2008.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) Pronator teres

This answer is correct.


Typically, the nerve to pronator teres is the most proximal branch off of the median nerve, followed by branches to flexor carpi radialis, palmaris longus, and flexor digitorum superficialis. The following images show the median nerve and the proximal muscles it innervates:
  (See References)

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B) Opponens pollicis

This answer is incorrect.


Typically, the nerve to pronator teres is the most proximal branch off of the median nerve, followed by branches to flexor carpi radialis, palmaris longus, and flexor digitorum superficialis. Opponens pollicis is one of the most distal muscles innervated by the median nerve.   (See References)

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C) Extensor carpi radialis longus

This answer is incorrect.


Extensor carpi radialis longus is innervated by the radial nerve.  (See References)

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D) Flexor digitorum profundus

This answer is incorrect.


Typically, the nerve to pronator teres is the most proximal branch off of the median nerve, followed by branches to flexor carpi radialis, palmaris longus, and flexor digitorum superficialis.   (See References)

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E) Flexor pollicis longus

This answer is incorrect.


Typically, the nerve to pronator teres is the most proximal branch off of the median nerve, followed by branches to flexor carpi radialis, palmaris longus, and flexor digitorum superficialis.   (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:
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anatomy
Upper extremity muscle function and innervation 01
Question ID: 073108059
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 07/31/2008
Modified: 07/31/2008
Estimated Permutations: 8400

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