nerves innervating the muscles of the upper extremity

Topic: Anatomy

Created on Sunday, September 3 2006 by

Last modified on Sunday, September 3 2006.

 
        A) Triceps receives innervation from spinal segment C6.
 
        B) Extensor pollicis brevis receives innervation from the brachial plexus.
 
        C) Flexor digitorum profundus IV receives innervation from spinal segment C7.
 
        D) Extensor digitorum receives innervation from radial nerve.
 
        E) Pronator quadratus 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

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A) triceps receives innervation from spinal segment C6.

This answer is incorrect.

The statement, "triceps receives innervation from spinal segment C6." 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) extensor pollicis brevis receives innervation from the brachial plexus.

This answer is correct.

The statement, "extensor pollicis brevis receives innervation from the brachial plexus." is false.
extensor pollicis brevis 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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C) flexor digitorum profundus IV receives innervation from spinal segment C7.

This answer is incorrect.

The statement, "flexor digitorum profundus IV receives innervation from spinal segment C7." is true.
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 radial nerve.

This answer is incorrect.

The statement, "extensor digitorum receives innervation from radial nerve." is true.
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) pronator quadratus receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "pronator quadratus receives innervation from spinal segment C8." is true.
pronator quadratus 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
Estimated Permutations: 0