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) Extensor digitorum receives innervation from spinal segment C3.
 
        B) Pronator quadratus receives innervation from posterior interosseous nerve.
 
        C) Extensor pollicis longus receives innervation from anterior interosseous nerve.
 
        D) Flexor digitorum profundus II receives innervation from spinal segment C5.
 
        E) Abductor pollicis brevis receives innervation from median 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) 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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B) 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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C) extensor pollicis longus receives innervation from anterior interosseous nerve.

This answer is incorrect.

The statement, "extensor pollicis longus receives innervation from anterior interosseous 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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D) flexor digitorum profundus II receives innervation from spinal segment C5.

This answer is incorrect.

The statement, "flexor digitorum profundus II receives innervation from spinal segment C5." is false.
flexor digitorum profundus II 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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E) abductor pollicis brevis receives innervation from median nerve.

This answer is correct.

The statement, "abductor pollicis brevis receives innervation from median nerve." is true.
abductor pollicis brevis 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