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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 is most accurate regarding nerves innervating the muscles of the upper extremity?

 
        A) Flexor carpi radialis receives innervation from spinal segment C4.
 
        B) The dorsal interossei receives innervation from spinal segment C5.
 
        C) Extensor digitorum receives innervation from spinal segment C7.
 
        D) Flexor pollicis brevis receives innervation from posterior interosseous nerve.
 
        E) Supraspinatus receives innervation from median 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) flexor carpi radialis receives innervation from spinal segment C4.

This answer is incorrect.


The statement, "flexor carpi radialis receives innervation from spinal segment C4." is false.
flexor carpi radialis receives innervation from median nerve, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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B) the dorsal interossei receives innervation from spinal segment C5.

This answer is incorrect.


The statement, "the dorsal interossei receives innervation from spinal segment C5." is false.
the dorsal interossei receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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C) extensor digitorum receives innervation from spinal segment C7.

This answer is correct.


The statement, "extensor digitorum receives innervation from spinal segment C7." 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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D) flexor pollicis brevis receives innervation from posterior interosseous nerve.

This answer is incorrect.


The statement, "flexor pollicis brevis receives innervation from posterior interosseous nerve." is false.
flexor pollicis brevis receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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E) supraspinatus receives innervation from median nerve.

This answer is incorrect.


The statement, "supraspinatus receives innervation from median nerve." is false.
supraspinatus receives innervation from the brachial plexus, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (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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