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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) Extensor carpi radialis longus receives innervation from medial cutaneous nerve of the forearm.
 
        B) Flexor carpi radialis receives innervation from spinal segment C6.
 
        C) Latissimus dorsi receives innervation from the brachial plexus.
 
        D) Brachioradialis receives innervation from radial nerve.
 
        E) Extensor pollicis longus receives innervation from spinal segment C8.
 

 


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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) extensor carpi radialis longus receives innervation from medial cutaneous nerve of the forearm.

This answer is correct.


The statement, "extensor carpi radialis longus receives innervation from medial cutaneous nerve of the forearm." is false.
extensor carpi radialis longus receives innervation from radial nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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B) flexor carpi radialis receives innervation from spinal segment C6.

This answer is incorrect.


The statement, "flexor carpi radialis receives innervation from spinal segment C6." is true.
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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C) latissimus dorsi receives innervation from the brachial plexus.

This answer is incorrect.


The statement, "latissimus dorsi receives innervation from the brachial plexus." is true.
latissimus dorsi receives innervation from the brachial plexus, receives innervation from spinal segment C6, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (See References)

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D) brachioradialis receives innervation from radial nerve.

This answer is incorrect.


The statement, "brachioradialis receives innervation from radial nerve." is true.
brachioradialis receives innervation from radial nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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E) extensor pollicis longus receives innervation from spinal segment C8.

This answer is incorrect.


The statement, "extensor pollicis longus receives innervation from spinal segment C8." is true.
extensor pollicis longus 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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