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 II receives innervation from spinal segment C3.
 
        B) Supraspinatus receives innervation from median nerve.
 
        C) Flexor carpi radialis receives innervation from posterior interosseous nerve.
 
        D) Extensor pollicis brevis receives innervation from spinal segment C1.
 
        E) Trapezius receives innervation from spinal accessory 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 II receives innervation from spinal segment C3.

This answer is incorrect.

The statement, "lumbricals II receives innervation from spinal segment C3." is false.
lumbricals II 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) supraspinatus receives innervation from median nerve.

This answer is incorrect.

The statement, "supraspinatus receives innervation from median nerve." is false.
supraspinatus receives innervation from the brachial plexus, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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C) flexor carpi radialis receives innervation from posterior interosseous nerve.

This answer is incorrect.

The statement, "flexor carpi radialis receives innervation from posterior interosseous nerve." is false.
flexor carpi radialis receives innervation from median nerve, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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D) extensor pollicis brevis receives innervation from spinal segment C1.

This answer is incorrect.

The statement, "extensor pollicis brevis receives innervation from spinal segment C1." is false.
extensor pollicis brevis 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) trapezius receives innervation from spinal accessory nerve.

This answer is correct.

The statement, "trapezius receives innervation from spinal accessory nerve." is true.
trapezius receives innervation from spinal accessory nerve, receives innervation from spinal segment C3, and receives innervation from spinal segment C4.  (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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