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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) Latissimus dorsi receives innervation from medial cutaneous nerve of the arm.
 
        B) Flexor digitorum profundus III receives innervation from spinal segment C8.
 
        C) Lumbricals IV receives innervation from anterior interosseous nerve.
 
        D) Supraspinatus receives innervation from ulnar nerve.
 
        E) Brachialis receives innervation from spinal segment T1.
 

 


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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) latissimus dorsi receives innervation from medial cutaneous nerve of the arm.

This answer is incorrect.


The statement, "latissimus dorsi receives innervation from medial cutaneous nerve of the arm." is false.
latissimus dorsi receives innervation from the brachial plexus, 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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B) flexor digitorum profundus III receives innervation from spinal segment C8.

This answer is correct.


The statement, "flexor digitorum profundus III receives innervation from spinal segment C8." is true.
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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C) lumbricals IV receives innervation from anterior interosseous nerve.

This answer is incorrect.


The statement, "lumbricals IV receives innervation from anterior interosseous nerve." is false.
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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D) supraspinatus receives innervation from ulnar nerve.

This answer is incorrect.


The statement, "supraspinatus receives innervation from ulnar nerve." 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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E) brachialis receives innervation from spinal segment T1.

This answer is incorrect.


The statement, "brachialis receives innervation from spinal segment T1." is false.
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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