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 accessory nerve.
 
        B) Lumbricals III receives innervation from axillary nerve.
 
        C) Flexor digitorum profundus IV receives innervation from medial cutaneous nerve of the forearm.
 
        D) Lumbricals IV receives innervation from spinal segment T1.
 
        E) Deltoid 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) flexor digitorum profundus III receives innervation from spinal accessory nerve.

This answer is incorrect.

The statement, "flexor digitorum profundus III receives innervation from spinal accessory nerve." 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) lumbricals III receives innervation from axillary nerve.

This answer is incorrect.

The statement, "lumbricals III receives innervation from axillary nerve." is false.
lumbricals III receives innervation from ulnar nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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C) flexor digitorum profundus IV receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.

The statement, "flexor digitorum profundus IV receives innervation from medial cutaneous nerve of the forearm." is false.
flexor digitorum profundus IV receives innervation from ulnar nerve, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (See References)

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D) lumbricals IV receives innervation from spinal segment T1.

This answer is correct.

The statement, "lumbricals IV receives innervation from spinal segment T1." is true.
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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E) deltoid receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.

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