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) Triceps receives innervation from musculocutaneous nerve.
 
        B) Rhomboids receives innervation from spinal segment C4.
 
        C) Extensor pollicis brevis receives innervation from posterior interosseous nerve.
 
        D) Pectoralis major receives innervation from the brachial plexus.
 
        E) Pronator quadratus 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) triceps receives innervation from musculocutaneous nerve.

This answer is correct.

The statement, "triceps receives innervation from musculocutaneous nerve." is false.
triceps receives innervation from radial nerve, 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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B) rhomboids receives innervation from spinal segment C4.

This answer is incorrect.

The statement, "rhomboids receives innervation from spinal segment C4." 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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C) extensor pollicis brevis receives innervation from posterior interosseous nerve.

This answer is incorrect.

The statement, "extensor pollicis brevis receives innervation from posterior interosseous nerve." is true.
extensor pollicis brevis 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) pectoralis major receives innervation from the brachial plexus.

This answer is incorrect.

The statement, "pectoralis major receives innervation from the brachial plexus." 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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E) pronator quadratus receives innervation from median nerve.

This answer is incorrect.

The statement, "pronator quadratus receives innervation from median nerve." is true.
pronator quadratus receives innervation from median nerve, receives innervation from anterior 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