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 spinal segment C5.
 
        B) Biceps brachii receives innervation from median nerve.
 
        C) Deltoid receives innervation from axillary nerve.
 
        D) Brachioradialis receives innervation from spinal segment C3.
 
        E) Flexor pollicis longus receives innervation from spinal segment C5.
 

 

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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 spinal segment C5.

This answer is incorrect.

The statement, "lumbricals III receives innervation from spinal segment C5." 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) biceps brachii receives innervation from median nerve.

This answer is incorrect.

The statement, "biceps brachii receives innervation from median nerve." is false.
biceps brachii receives innervation from musculocutaneous nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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C) deltoid receives innervation from axillary nerve.

This answer is correct.

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

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D) brachioradialis receives innervation from spinal segment C3.

This answer is incorrect.

The statement, "brachioradialis receives innervation from spinal segment C3." is false.
brachioradialis receives innervation from radial nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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E) flexor pollicis longus receives innervation from spinal segment C5.

This answer is incorrect.

The statement, "flexor pollicis longus receives innervation from spinal segment C5." is false.
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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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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