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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) Infraspinatus receives innervation from spinal segment C2.
 
        B) The palmar interossei receives innervation from spinal accessory nerve.
 
        C) Brachioradialis receives innervation from medial cutaneous nerve of the forearm.
 
        D) Lumbricals IV receives innervation from spinal segment C8.
 
        E) Triceps receives innervation from medial cutaneous nerve of the arm.
 

 


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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) infraspinatus receives innervation from spinal segment C2.

This answer is incorrect.


The statement, "infraspinatus receives innervation from spinal segment C2." is false.
infraspinatus 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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B) the palmar interossei receives innervation from spinal accessory nerve.

This answer is incorrect.


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

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C) brachioradialis receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.


The statement, "brachioradialis receives innervation from medial cutaneous nerve of the forearm." 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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D) lumbricals IV receives innervation from spinal segment C8.

This answer is correct.


The statement, "lumbricals IV receives innervation from spinal segment C8." is true.
lumbricals IV 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) triceps receives innervation from medial cutaneous nerve of the arm.

This answer is incorrect.


The statement, "triceps receives innervation from medial cutaneous nerve of the arm." is false.
triceps receives innervation from radial nerve, receives innervation from spinal segment C6, 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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