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) Lumbricals III receives innervation from spinal segment C8.
 
        B) Extensor carpi radialis longus receives innervation from spinal segment C6.
 
        C) The dorsal interossei receives innervation from spinal segment C8.
 
        D) Adductor pollicis receives innervation from the brachial plexus.
 
        E) Abductor pollicis brevis receives innervation from median 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

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A) lumbricals III receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "lumbricals III receives innervation from spinal segment C8." is true.
lumbricals III receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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B) extensor carpi radialis longus receives innervation from spinal segment C6.

This answer is incorrect.

The statement, "extensor carpi radialis longus receives innervation from spinal segment C6." is true.
extensor carpi radialis longus receives innervation from radial nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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C) the dorsal interossei receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "the dorsal interossei receives innervation from spinal segment C8." is true.
the dorsal interossei receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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D) adductor pollicis receives innervation from the brachial plexus.

This answer is correct.

The statement, "adductor pollicis receives innervation from the brachial plexus." 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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E) abductor pollicis brevis receives innervation from median nerve.

This answer is incorrect.

The statement, "abductor pollicis brevis receives innervation from median nerve." 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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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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