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nerves innervating the muscles of the upper extremity

Topic: Anatomy

Created on Sunday, September 3 2006 by

Last modified on Sunday, September 3 2006.

Which of the following statements regarding nerves innervating the muscles of the upper extremity is FALSE?

 
        A) Adductor pollicis receives innervation from axillary nerve.
 
        B) Flexor digitorum superficialis receives innervation from spinal segment C7.
 
        C) Pronator teres receives innervation from spinal segment C6.
 
        D) Adductor pollicis receives innervation from spinal segment T1.
 
        E) Extensor digitorum receives innervation from radial nerve.
 

 


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This question was created on September 03, 2006 by .
This question was last modified on September 03, 2006.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) adductor pollicis receives innervation from axillary nerve.

This answer is correct.


The statement, "adductor pollicis receives innervation from axillary nerve." is false.
adductor pollicis receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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B) flexor digitorum superficialis receives innervation from spinal segment C7.

This answer is incorrect.


The statement, "flexor digitorum superficialis receives innervation from spinal segment C7." is true.
flexor digitorum superficialis receives innervation from median nerve, receives innervation from spinal segment C7, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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C) pronator teres receives innervation from spinal segment C6.

This answer is incorrect.


The statement, "pronator teres receives innervation from spinal segment C6." is true.
pronator teres receives innervation from median nerve, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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D) adductor pollicis receives innervation from spinal segment T1.

This answer is incorrect.


The statement, "adductor pollicis receives innervation from spinal segment T1." is true.
adductor pollicis receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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E) extensor digitorum receives innervation from radial nerve.

This answer is incorrect.


The statement, "extensor digitorum receives innervation from radial nerve." is true.
extensor digitorum receives innervation from radial nerve, receives innervation from posterior interosseous nerve, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (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.
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anatomy
nerves innervating the muscles of the upper extremity
Question ID: 683156834
Question written by . (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 09/03/2006
Modified: 09/03/2006
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