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) The dorsal interossei receives innervation from spinal segment C5.
 
        B) Flexor pollicis longus receives innervation from median nerve.
 
        C) Extensor digitorum receives innervation from spinal segment C3.
 
        D) Pectoralis major receives innervation from anterior interosseous nerve.
 
        E) Opponens pollicis receives innervation from ulnar 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) the dorsal interossei receives innervation from spinal segment C5.

This answer is incorrect.

The statement, "the dorsal interossei receives innervation from spinal segment C5." is false.
the dorsal interossei receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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B) flexor pollicis longus receives innervation from median nerve.

This answer is correct.

The statement, "flexor pollicis longus receives innervation from median nerve." 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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C) extensor digitorum receives innervation from spinal segment C3.

This answer is incorrect.

The statement, "extensor digitorum receives innervation from spinal segment C3." is false.
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) pectoralis major receives innervation from anterior interosseous nerve.

This answer is incorrect.

The statement, "pectoralis major receives innervation from anterior interosseous nerve." is false.
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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E) opponens pollicis receives innervation from ulnar nerve.

This answer is incorrect.

The statement, "opponens pollicis receives innervation from ulnar nerve." is false.
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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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
Estimated Permutations: 0