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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) Brachialis receives innervation from medial cutaneous nerve of the forearm.
 
        B) Pronator teres receives innervation from posterior interosseous nerve.
 
        C) Latissimus dorsi receives innervation from posterior interosseous nerve.
 
        D) Extensor carpi ulnaris receives innervation from posterior interosseous nerve.
 
        E) Flexor digitorum profundus II receives innervation from musculocutaneous 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) brachialis receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.


The statement, "brachialis receives innervation from medial cutaneous nerve of the forearm." is false.
brachialis receives innervation from musculocutaneous nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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B) pronator teres receives innervation from posterior interosseous nerve.

This answer is incorrect.


The statement, "pronator teres receives innervation from posterior interosseous nerve." is false.
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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C) latissimus dorsi receives innervation from posterior interosseous nerve.

This answer is incorrect.


The statement, "latissimus dorsi receives innervation from posterior interosseous nerve." is false.
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) extensor carpi ulnaris receives innervation from posterior interosseous nerve.

This answer is correct.


The statement, "extensor carpi ulnaris receives innervation from posterior interosseous nerve." is true.
extensor carpi ulnaris 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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E) flexor digitorum profundus II receives innervation from musculocutaneous nerve.

This answer is incorrect.


The statement, "flexor digitorum profundus II receives innervation from musculocutaneous nerve." is false.
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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