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) Extensor carpi radialis longus receives innervation from spinal segment C8.
 
        B) Biceps brachii receives innervation from spinal segment C5.
 
        C) The palmar interossei receives innervation from median nerve.
 
        D) Infraspinatus receives innervation from medial cutaneous nerve of the forearm.
 
        E) Infraspinatus receives innervation from spinal segment C2.
 

 

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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) extensor carpi radialis longus receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "extensor carpi radialis longus receives innervation from spinal segment C8." is false.
extensor carpi radialis longus receives innervation from radial nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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B) biceps brachii receives innervation from spinal segment C5.

This answer is correct.

The statement, "biceps brachii receives innervation from spinal segment C5." is true.
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) the palmar interossei receives innervation from median nerve.

This answer is incorrect.

The statement, "the palmar interossei receives innervation from median 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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D) infraspinatus receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.

The statement, "infraspinatus receives innervation from medial cutaneous nerve of the forearm." 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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E) 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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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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