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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) Flexor pollicis longus receives innervation from spinal segment C4.
 
        B) Extensor pollicis brevis receives innervation from median nerve.
 
        C) Flexor digitorum profundus III receives innervation from musculocutaneous nerve.
 
        D) Latissimus dorsi receives innervation from median 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




A) flexor pollicis longus receives innervation from spinal segment C4.

This answer is incorrect.


The statement, "flexor pollicis longus receives innervation from spinal segment C4." is false.
flexor pollicis longus 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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B) extensor pollicis brevis receives innervation from median nerve.

This answer is incorrect.


The statement, "extensor pollicis brevis receives innervation from median nerve." 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 III receives innervation from musculocutaneous nerve.

This answer is incorrect.


The statement, "flexor digitorum profundus III receives innervation from musculocutaneous nerve." is false.
flexor digitorum profundus III 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) latissimus dorsi receives innervation from median nerve.

This answer is incorrect.


The statement, "latissimus dorsi receives innervation from median nerve." is false.
latissimus dorsi receives innervation from the brachial plexus, 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) pronator quadratus receives innervation from spinal segment C8.

This answer is correct.


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
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