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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 ulnaris receives innervation from anterior interosseous nerve.
 
        B) Brachioradialis receives innervation from medial cutaneous nerve of the forearm.
 
        C) Lumbricals III receives innervation from radial nerve.
 
        D) The dorsal interossei receives innervation from spinal segment C1.
 
        E) Flexor digitorum profundus II receives innervation from spinal segment C7.
 

 


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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 ulnaris receives innervation from anterior interosseous nerve.

This answer is incorrect.


The statement, "flexor carpi ulnaris receives innervation from anterior interosseous nerve." is false.
flexor carpi ulnaris receives innervation from ulnar 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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B) brachioradialis receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.


The statement, "brachioradialis receives innervation from medial cutaneous nerve of the forearm." is false.
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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C) lumbricals III receives innervation from radial nerve.

This answer is incorrect.


The statement, "lumbricals III receives innervation from radial nerve." is false.
lumbricals III receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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D) the dorsal interossei receives innervation from spinal segment C1.

This answer is incorrect.


The statement, "the dorsal interossei receives innervation from spinal segment C1." 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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E) flexor digitorum profundus II receives innervation from spinal segment C7.

This answer is correct.


The statement, "flexor digitorum profundus II receives innervation from spinal segment C7." is true.
flexor digitorum profundus II receives innervation from median nerve, receives innervation from anterior 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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