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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) Pronator teres receives innervation from radial nerve.
 
        B) Triceps receives innervation from spinal segment C4.
 
        C) Flexor digitorum profundus IV receives innervation from spinal accessory nerve.
 
        D) Extensor digitorum receives innervation from ulnar nerve.
 
        E) Opponens pollicis 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) pronator teres receives innervation from radial nerve.

This answer is incorrect.


The statement, "pronator teres receives innervation from radial 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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B) triceps receives innervation from spinal segment C4.

This answer is incorrect.


The statement, "triceps receives innervation from spinal segment C4." is false.
triceps receives innervation from radial nerve, 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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C) flexor digitorum profundus IV receives innervation from spinal accessory nerve.

This answer is incorrect.


The statement, "flexor digitorum profundus IV receives innervation from spinal accessory nerve." is false.
flexor digitorum profundus IV receives innervation from ulnar nerve, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (See References)

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D) extensor digitorum receives innervation from ulnar nerve.

This answer is incorrect.


The statement, "extensor digitorum receives innervation from ulnar nerve." is false.
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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E) opponens pollicis receives innervation from spinal segment C8.

This answer is correct.


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