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) Extensor indicis receives innervation from the brachial plexus.
 
        B) Infraspinatus receives innervation from spinal segment C5.
 
        C) Pronator teres receives innervation from median nerve.
 
        D) Extensor indicis receives innervation from posterior interosseous nerve.
 
        E) Lumbricals I receives innervation from spinal segment T1.
 

 

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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) extensor indicis receives innervation from the brachial plexus.

This answer is correct.

The statement, "extensor indicis receives innervation from the brachial plexus." 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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B) infraspinatus receives innervation from spinal segment C5.

This answer is incorrect.

The statement, "infraspinatus receives innervation from spinal segment C5." is true.
infraspinatus receives innervation from the brachial plexus, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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C) pronator teres receives innervation from median nerve.

This answer is incorrect.

The statement, "pronator teres receives innervation from median nerve." is true.
pronator teres receives innervation from median nerve, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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D) extensor indicis receives innervation from posterior interosseous nerve.

This answer is incorrect.

The statement, "extensor indicis receives innervation from posterior interosseous 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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E) lumbricals I receives innervation from spinal segment T1.

This answer is incorrect.

The statement, "lumbricals I receives innervation from spinal segment T1." is true.
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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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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