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) The dorsal interossei receives innervation from spinal segment C8.
 
        B) Supinator receives innervation from radial nerve.
 
        C) Deltoid receives innervation from spinal segment C6.
 
        D) Flexor digitorum profundus III receives innervation from ulnar nerve.
 
        E) Lumbricals II receives innervation from medial cutaneous nerve of the forearm.
 

 

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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) the dorsal interossei receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "the dorsal interossei receives innervation from spinal segment C8." is true.
the dorsal 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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B) supinator receives innervation from radial nerve.

This answer is incorrect.

The statement, "supinator receives innervation from radial nerve." is true.
supinator receives innervation from radial nerve, receives innervation from posterior interosseous nerve, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (See References)

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C) deltoid receives innervation from spinal segment C6.

This answer is incorrect.

The statement, "deltoid receives innervation from spinal segment C6." is true.
deltoid receives innervation from axillary nerve, receives innervation from spinal segment C5, and receives innervation from spinal segment C6.  (See References)

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D) flexor digitorum profundus III receives innervation from ulnar nerve.

This answer is incorrect.

The statement, "flexor digitorum profundus III receives innervation from ulnar nerve." 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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E) lumbricals II receives innervation from medial cutaneous nerve of the forearm.

This answer is correct.

The statement, "lumbricals II receives innervation from medial cutaneous nerve of the forearm." is false.
lumbricals II receives innervation from median nerve, 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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