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) Flexor carpi radialis receives innervation from spinal segment C6.
 
        B) Pectoralis major receives innervation from spinal segment C6.
 
        C) Infraspinatus receives innervation from musculocutaneous nerve.
 
        D) Brachioradialis receives innervation from spinal segment C6.
 
        E) Flexor pollicis longus receives innervation from spinal segment C7.
 

 

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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) flexor carpi radialis receives innervation from spinal segment C6.

This answer is incorrect.

The statement, "flexor carpi radialis receives innervation from spinal segment C6." is true.
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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B) 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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C) infraspinatus receives innervation from musculocutaneous nerve.

This answer is correct.

The statement, "infraspinatus receives innervation from musculocutaneous nerve." is false.
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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D) brachioradialis receives innervation from spinal segment C6.

This answer is incorrect.

The statement, "brachioradialis receives innervation from spinal segment C6." is true.
brachioradialis receives innervation from radial nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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E) flexor pollicis longus receives innervation from spinal segment C7.

This answer is incorrect.

The statement, "flexor pollicis longus receives innervation from spinal segment C7." is true.
flexor pollicis longus 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
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