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 T1.
 
        B) Pectoralis major receives innervation from spinal segment C1.
 
        C) Extensor indicis receives innervation from spinal segment C8.
 
        D) Rhomboids receives innervation from spinal segment C5.
 
        E) Pectoralis major receives innervation from spinal segment C6.
 

 

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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 T1.

This answer is incorrect.

The statement, "lumbricals III receives innervation from spinal segment T1." 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) pectoralis major receives innervation from spinal segment C1.

This answer is correct.

The statement, "pectoralis major receives innervation from spinal segment C1." is false.
pectoralis major receives innervation from the brachial plexus, receives innervation from spinal segment C5, receives innervation from spinal segment C6, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (See References)

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C) extensor indicis receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "extensor indicis receives innervation from spinal segment C8." 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) rhomboids receives innervation from spinal segment C5.

This answer is incorrect.

The statement, "rhomboids receives innervation from spinal segment C5." is true.
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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E) pectoralis major receives innervation from spinal segment C6.

This answer is incorrect.

The statement, "pectoralis major receives innervation from spinal segment C6." is true.
pectoralis major receives innervation from the brachial plexus, receives innervation from spinal segment C5, receives innervation from spinal segment C6, 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