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 digitorum profundus III receives innervation from spinal segment C4.
 
        B) Extensor carpi radialis longus receives innervation from radial nerve.
 
        C) Adductor pollicis receives innervation from spinal segment C8.
 
        D) Supraspinatus receives innervation from the brachial plexus.
 
        E) Flexor digitorum superficialis receives innervation from spinal segment C7.
 

 

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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 digitorum profundus III receives innervation from spinal segment C4.

This answer is correct.

The statement, "flexor digitorum profundus III receives innervation from spinal segment C4." is false.
flexor digitorum profundus III receives innervation from ulnar nerve, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (See References)

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B) extensor carpi radialis longus receives innervation from radial nerve.

This answer is incorrect.

The statement, "extensor carpi radialis longus receives innervation from radial nerve." is true.
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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C) adductor pollicis receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "adductor pollicis receives innervation from spinal segment C8." is true.
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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D) supraspinatus receives innervation from the brachial plexus.

This answer is incorrect.

The statement, "supraspinatus receives innervation from the brachial plexus." is true.
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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E) flexor digitorum superficialis receives innervation from spinal segment C7.

This answer is incorrect.

The statement, "flexor digitorum superficialis receives innervation from spinal segment C7." is true.
flexor digitorum superficialis receives innervation from median 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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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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