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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 IV receives innervation from spinal segment C1.
 
        B) Flexor carpi radialis receives innervation from spinal segment T1.
 
        C) Serratus anterior receives innervation from ulnar nerve.
 
        D) Lumbricals III receives innervation from medial cutaneous nerve of the arm.
 
        E) Extensor digitorum receives innervation from radial 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) lumbricals IV receives innervation from spinal segment C1.

This answer is incorrect.


The statement, "lumbricals IV receives innervation from spinal segment C1." is false.
lumbricals IV 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) flexor carpi radialis receives innervation from spinal segment T1.

This answer is incorrect.


The statement, "flexor carpi radialis receives innervation from spinal segment T1." is false.
flexor carpi radialis receives innervation from median nerve, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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C) serratus anterior receives innervation from ulnar nerve.

This answer is incorrect.


The statement, "serratus anterior receives innervation from ulnar nerve." is false.
serratus anterior receives innervation from the brachial plexus, receives innervation from spinal segment C5, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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D) lumbricals III receives innervation from medial cutaneous nerve of the arm.

This answer is incorrect.


The statement, "lumbricals III receives innervation from medial cutaneous nerve of the arm." is false.
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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E) extensor digitorum receives innervation from radial nerve.

This answer is correct.


The statement, "extensor digitorum receives innervation from radial nerve." is true.
extensor digitorum 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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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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