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nerves innervating the muscles of the upper extremity

Topic: Anatomy

Created on Sunday, September 3 2006 by

Last modified on Sunday, September 3 2006.

Which of the following is most accurate regarding nerves innervating the muscles of the upper extremity?

 
        A) Teres major receives innervation from medial cutaneous nerve of the arm.
 
        B) Flexor carpi radialis receives innervation from spinal accessory nerve.
 
        C) The hypothenar muscles receives innervation from spinal accessory nerve.
 
        D) Adductor pollicis receives innervation from musculocutaneous nerve.
 
        E) Brachialis 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




A) teres major receives innervation from medial cutaneous nerve of the arm.

This answer is incorrect.


The statement, "teres major receives innervation from medial cutaneous nerve of the arm." is false.
teres major receives innervation from the brachial plexus, receives innervation from spinal segment C5, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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B) flexor carpi radialis receives innervation from spinal accessory nerve.

This answer is incorrect.


The statement, "flexor carpi radialis receives innervation from spinal accessory 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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C) the hypothenar muscles receives innervation from spinal accessory nerve.

This answer is incorrect.


The statement, "the hypothenar muscles receives innervation from spinal accessory nerve." is false.
the hypothenar muscles receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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D) adductor pollicis receives innervation from musculocutaneous nerve.

This answer is incorrect.


The statement, "adductor pollicis receives innervation from musculocutaneous nerve." is false.
adductor pollicis receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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E) brachialis receives innervation from spinal segment C5.

This answer is correct.


The statement, "brachialis receives innervation from spinal segment C5." 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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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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