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) Rhomboids receives innervation from spinal segment C7.
 
        B) Teres major receives innervation from radial nerve.
 
        C) Extensor indicis receives innervation from radial nerve.
 
        D) Lumbricals I receives innervation from anterior interosseous nerve.
 
        E) Extensor indicis receives innervation from spinal segment T2.
 

 

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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) rhomboids receives innervation from spinal segment C7.

This answer is incorrect.

The statement, "rhomboids receives innervation from spinal segment C7." is false.
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) teres major receives innervation from radial nerve.

This answer is incorrect.

The statement, "teres major receives innervation from radial nerve." is false.
teres major 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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C) extensor indicis receives innervation from radial nerve.

This answer is correct.

The statement, "extensor indicis receives innervation from radial nerve." is true.
extensor indicis 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) lumbricals I receives innervation from anterior interosseous nerve.

This answer is incorrect.

The statement, "lumbricals I receives innervation from anterior interosseous nerve." is false.
lumbricals I 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) extensor indicis receives innervation from spinal segment T2.

This answer is incorrect.

The statement, "extensor indicis receives innervation from spinal segment T2." is false.
extensor indicis 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
Estimated Permutations: 0