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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) Lumbricals II receives innervation from axillary nerve.
 
        B) Abductor pollicis brevis receives innervation from radial nerve.
 
        C) Extensor carpi ulnaris receives innervation from radial nerve.
 
        D) Extensor pollicis longus receives innervation from spinal segment C1.
 
        E) Adductor pollicis receives innervation from spinal segment C4.
 

 


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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) lumbricals II receives innervation from axillary nerve.

This answer is incorrect.


The statement, "lumbricals II receives innervation from axillary nerve." is false.
lumbricals II receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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B) abductor pollicis brevis receives innervation from radial nerve.

This answer is incorrect.


The statement, "abductor pollicis brevis receives innervation from radial nerve." is false.
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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C) extensor carpi ulnaris receives innervation from radial nerve.

This answer is correct.


The statement, "extensor carpi ulnaris receives innervation from radial nerve." is true.
extensor carpi ulnaris 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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D) extensor pollicis longus receives innervation from spinal segment C1.

This answer is incorrect.


The statement, "extensor pollicis longus receives innervation from spinal segment C1." is false.
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) adductor pollicis receives innervation from spinal segment C4.

This answer is incorrect.


The statement, "adductor pollicis receives innervation from spinal segment C4." is false.
adductor pollicis receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (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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