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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) Triceps receives innervation from spinal segment C8.
 
        B) Rhomboids receives innervation from the brachial plexus.
 
        C) Flexor digitorum profundus IV receives innervation from spinal segment C3.
 
        D) Pectoralis major receives innervation from spinal segment C8.
 
        E) Pectoralis major receives innervation from spinal segment C5.
 

 


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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) triceps receives innervation from spinal segment C8.

This answer is incorrect.


The statement, "triceps receives innervation from spinal segment C8." is true.
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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B) rhomboids receives innervation from the brachial plexus.

This answer is incorrect.


The statement, "rhomboids receives innervation from the brachial plexus." is true.
rhomboids receives innervation from the brachial plexus, receives innervation from spinal segment C4, and receives innervation from spinal segment C5.  (See References)

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C) flexor digitorum profundus IV receives innervation from spinal segment C3.

This answer is correct.


The statement, "flexor digitorum profundus IV receives innervation from spinal segment C3." 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) pectoralis major receives innervation from spinal segment C8.

This answer is incorrect.


The statement, "pectoralis major receives innervation from spinal segment C8." is true.
pectoralis major receives innervation from the brachial plexus, receives innervation from spinal segment C5, 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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E) pectoralis major receives innervation from spinal segment C5.

This answer is incorrect.


The statement, "pectoralis major receives innervation from spinal segment C5." is true.
pectoralis major receives innervation from the brachial plexus, receives innervation from spinal segment C5, 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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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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