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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) Extensor pollicis brevis receives innervation from radial nerve.
 
        B) Flexor digitorum superficialis receives innervation from median nerve.
 
        C) Flexor carpi ulnaris receives innervation from spinal segment C8.
 
        D) Extensor pollicis longus receives innervation from radial nerve.
 
        E) Triceps 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 pollicis brevis receives innervation from radial nerve.

This answer is incorrect.


The statement, "extensor pollicis brevis receives innervation from radial nerve." is true.
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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B) flexor digitorum superficialis receives innervation from median nerve.

This answer is incorrect.


The statement, "flexor digitorum superficialis receives innervation from median nerve." is true.
flexor digitorum superficialis receives innervation from median nerve, receives innervation from spinal segment C7, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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C) flexor carpi ulnaris receives innervation from spinal segment C8.

This answer is incorrect.


The statement, "flexor carpi ulnaris receives innervation from spinal segment C8." is true.
flexor carpi ulnaris receives innervation from ulnar nerve, receives innervation from spinal segment C7, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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D) extensor pollicis longus receives innervation from radial nerve.

This answer is incorrect.


The statement, "extensor pollicis longus receives innervation from radial nerve." is true.
extensor pollicis longus 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) triceps receives innervation from musculocutaneous nerve.

This answer is correct.


The statement, "triceps receives innervation from musculocutaneous nerve." 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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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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