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 spinal segment T2.
 
        B) Lumbricals IV receives innervation from spinal segment C2.
 
        C) Teres major receives innervation from axillary nerve.
 
        D) Supinator receives innervation from spinal segment C7.
 
        E) Lumbricals II receives innervation from the brachial plexus.
 

 

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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 spinal segment T2.

This answer is incorrect.

The statement, "supraspinatus receives innervation from spinal segment T2." 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) lumbricals IV receives innervation from spinal segment C2.

This answer is incorrect.

The statement, "lumbricals IV receives innervation from spinal segment C2." is false.
lumbricals IV receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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C) teres major receives innervation from axillary nerve.

This answer is incorrect.

The statement, "teres major receives innervation from axillary nerve." is false.
teres major 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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D) supinator receives innervation from spinal segment C7.

This answer is correct.

The statement, "supinator receives innervation from spinal segment C7." is true.
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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E) lumbricals II receives innervation from the brachial plexus.

This answer is incorrect.

The statement, "lumbricals II receives innervation from the brachial plexus." is false.
lumbricals II 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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