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) Flexor carpi radialis receives innervation from axillary nerve.
 
        B) Infraspinatus receives innervation from musculocutaneous nerve.
 
        C) Biceps brachii receives innervation from spinal segment C3.
 
        D) Flexor carpi ulnaris receives innervation from spinal segment C7.
 
        E) Supraspinatus receives innervation from spinal segment C3.
 

 

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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) flexor carpi radialis receives innervation from axillary nerve.

This answer is incorrect.

The statement, "flexor carpi radialis receives innervation from axillary 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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B) infraspinatus receives innervation from musculocutaneous nerve.

This answer is incorrect.

The statement, "infraspinatus receives innervation from musculocutaneous nerve." 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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C) biceps brachii receives innervation from spinal segment C3.

This answer is incorrect.

The statement, "biceps brachii receives innervation from spinal segment C3." 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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D) flexor carpi ulnaris receives innervation from spinal segment C7.

This answer is correct.

The statement, "flexor carpi ulnaris receives innervation from spinal segment C7." is true.
flexor carpi ulnaris receives innervation from ulnar nerve, receives innervation from spinal segment C7, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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E) supraspinatus receives innervation from spinal segment C3.

This answer is incorrect.

The statement, "supraspinatus receives innervation from spinal segment C3." 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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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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