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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) Flexor digitorum profundus II receives innervation from spinal segment C7.
 
        B) Adductor pollicis receives innervation from median nerve.
 
        C) Supraspinatus receives innervation from medial cutaneous nerve of the arm.
 
        D) Flexor carpi ulnaris receives innervation from spinal accessory nerve.
 
        E) Lumbricals IV receives innervation from medial cutaneous nerve of the arm.
 

 


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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) flexor digitorum profundus II receives innervation from spinal segment C7.

This answer is correct.


The statement, "flexor digitorum profundus II receives innervation from spinal segment C7." is true.
flexor digitorum profundus II receives innervation from median nerve, receives innervation from anterior interosseous nerve, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (See References)

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B) adductor pollicis receives innervation from median nerve.

This answer is incorrect.


The statement, "adductor pollicis receives innervation from median nerve." is false.
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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C) supraspinatus receives innervation from medial cutaneous nerve of the arm.

This answer is incorrect.


The statement, "supraspinatus receives innervation from medial cutaneous nerve of the arm." 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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D) flexor carpi ulnaris receives innervation from spinal accessory nerve.

This answer is incorrect.


The statement, "flexor carpi ulnaris receives innervation from spinal accessory nerve." is false.
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) lumbricals IV receives innervation from medial cutaneous nerve of the arm.

This answer is incorrect.


The statement, "lumbricals IV receives innervation from medial cutaneous nerve of the arm." 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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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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