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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) Rhomboids receives innervation from spinal segment C5.
 
        B) Extensor pollicis brevis receives innervation from spinal segment C1.
 
        C) Abductor pollicis brevis receives innervation from spinal segment T1.
 
        D) Flexor pollicis brevis receives innervation from spinal segment T1.
 
        E) Flexor digitorum profundus II 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) rhomboids receives innervation from spinal segment C5.

This answer is incorrect.


The statement, "rhomboids receives innervation from spinal segment C5." 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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B) extensor pollicis brevis receives innervation from spinal segment C1.

This answer is correct.


The statement, "extensor pollicis brevis receives innervation from spinal segment C1." 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) abductor pollicis brevis receives innervation from spinal segment T1.

This answer is incorrect.


The statement, "abductor pollicis brevis receives innervation from spinal segment T1." is true.
abductor pollicis brevis receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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D) flexor pollicis brevis receives innervation from spinal segment T1.

This answer is incorrect.


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

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E) flexor digitorum profundus II receives innervation from spinal segment C8.

This answer is incorrect.


The statement, "flexor digitorum profundus II receives innervation from spinal segment C8." is true.
flexor digitorum profundus II 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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