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) Opponens pollicis receives innervation from spinal segment T1.
 
        B) Pronator quadratus receives innervation from spinal segment C7.
 
        C) Triceps receives innervation from radial nerve.
 
        D) Serratus anterior receives innervation from medial cutaneous nerve of the forearm.
 
        E) Deltoid receives innervation from axillary 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) opponens pollicis receives innervation from spinal segment T1.

This answer is incorrect.

The statement, "opponens pollicis receives innervation from spinal segment T1." is true.
opponens pollicis receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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B) pronator quadratus receives innervation from spinal segment C7.

This answer is incorrect.

The statement, "pronator quadratus receives innervation from spinal segment C7." 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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C) triceps receives innervation from radial nerve.

This answer is incorrect.

The statement, "triceps receives innervation from radial nerve." is true.
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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D) serratus anterior receives innervation from medial cutaneous nerve of the forearm.

This answer is correct.

The statement, "serratus anterior receives innervation from medial cutaneous nerve of the forearm." 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) deltoid receives innervation from axillary nerve.

This answer is incorrect.

The statement, "deltoid receives innervation from axillary nerve." is true.
deltoid receives innervation from axillary 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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