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) Lumbricals III receives innervation from musculocutaneous nerve.
 
        B) Flexor pollicis brevis receives innervation from spinal segment C8.
 
        C) Abductor pollicis brevis receives innervation from median nerve.
 
        D) Brachialis receives innervation from spinal segment C6.
 
        E) Pronator quadratus 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) lumbricals III receives innervation from musculocutaneous nerve.

This answer is correct.

The statement, "lumbricals III receives innervation from musculocutaneous nerve." 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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B) flexor pollicis brevis receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "flexor pollicis brevis receives innervation from spinal segment C8." is true.
flexor 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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C) abductor pollicis brevis receives innervation from median nerve.

This answer is incorrect.

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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D) brachialis receives innervation from spinal segment C6.

This answer is incorrect.

The statement, "brachialis receives innervation from spinal segment C6." is true.
brachialis receives innervation from musculocutaneous nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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E) pronator quadratus receives innervation from median nerve.

This answer is incorrect.

The statement, "pronator quadratus receives innervation from median nerve." 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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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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