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) Lumbricals III receives innervation from medial cutaneous nerve of the forearm.
 
        C) Pronator quadratus receives innervation from posterior interosseous nerve.
 
        D) Extensor pollicis longus receives innervation from ulnar nerve.
 
        E) Teres major receives innervation from spinal segment C1.
 

 

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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 correct.

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) lumbricals III receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.

The statement, "lumbricals III receives innervation from medial cutaneous nerve of the forearm." is false.
lumbricals III 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) pronator quadratus receives innervation from posterior interosseous nerve.

This answer is incorrect.

The statement, "pronator quadratus receives innervation from posterior interosseous nerve." is false.
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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D) extensor pollicis longus receives innervation from ulnar nerve.

This answer is incorrect.

The statement, "extensor pollicis longus receives innervation from ulnar nerve." is false.
extensor pollicis longus 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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E) teres major receives innervation from spinal segment C1.

This answer is incorrect.

The statement, "teres major receives innervation from spinal segment C1." 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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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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