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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) Extensor carpi ulnaris receives innervation from posterior interosseous nerve.
 
        B) Biceps brachii receives innervation from posterior interosseous nerve.
 
        C) Opponens pollicis receives innervation from medial cutaneous nerve of the forearm.
 
        D) Teres major receives innervation from medial cutaneous nerve of the forearm.
 
        E) The palmar interossei 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) 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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B) biceps brachii receives innervation from posterior interosseous nerve.

This answer is incorrect.


The statement, "biceps brachii receives innervation from posterior interosseous nerve." is false.
biceps brachii receives innervation from musculocutaneous nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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C) opponens pollicis receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.


The statement, "opponens pollicis receives innervation from medial cutaneous nerve of the forearm." is false.
opponens pollicis receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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D) teres major receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.


The statement, "teres major receives innervation from medial cutaneous nerve of the forearm." is false.
teres major receives innervation from the brachial plexus, receives innervation from spinal segment C5, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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E) the palmar interossei receives innervation from musculocutaneous nerve.

This answer is incorrect.


The statement, "the palmar interossei receives innervation from musculocutaneous nerve." is false.
the palmar 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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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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