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) Supraspinatus receives innervation from axillary nerve.
 
        B) Supinator receives innervation from ulnar nerve.
 
        C) Extensor digitorum receives innervation from posterior interosseous nerve.
 
        D) Serratus anterior receives innervation from spinal segment C3.
 
        E) Biceps brachii receives innervation from anterior interosseous 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) supraspinatus receives innervation from axillary nerve.

This answer is incorrect.

The statement, "supraspinatus receives innervation from axillary nerve." is false.
supraspinatus 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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B) supinator receives innervation from ulnar nerve.

This answer is incorrect.

The statement, "supinator receives innervation from ulnar nerve." is false.
supinator receives innervation from radial nerve, receives innervation from posterior interosseous nerve, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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C) extensor digitorum receives innervation from posterior interosseous nerve.

This answer is correct.

The statement, "extensor digitorum receives innervation from posterior interosseous nerve." is true.
extensor digitorum 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) serratus anterior receives innervation from spinal segment C3.

This answer is incorrect.

The statement, "serratus anterior receives innervation from spinal segment C3." is false.
serratus anterior 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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E) biceps brachii receives innervation from anterior interosseous nerve.

This answer is incorrect.

The statement, "biceps brachii receives innervation from anterior interosseous nerve." is false.
biceps brachii receives innervation from musculocutaneous nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (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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