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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 statements regarding nerves innervating the muscles of the upper extremity is FALSE?

 
        A) Lumbricals II receives innervation from median nerve.
 
        B) Abductor pollicis brevis receives innervation from spinal segment T1.
 
        C) Flexor digitorum superficialis receives innervation from median nerve.
 
        D) Infraspinatus receives innervation from medial cutaneous nerve of the forearm.
 
        E) Teres major 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




A) lumbricals II receives innervation from median nerve.

This answer is incorrect.


The statement, "lumbricals II receives innervation from median nerve." is true.
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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B) abductor pollicis brevis receives innervation from spinal segment T1.

This answer is incorrect.


The statement, "abductor pollicis brevis receives innervation from spinal segment T1." is true.
abductor pollicis brevis receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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C) flexor digitorum superficialis receives innervation from median nerve.

This answer is incorrect.


The statement, "flexor digitorum superficialis receives innervation from median nerve." 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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D) infraspinatus receives innervation from medial cutaneous nerve of the forearm.

This answer is correct.


The statement, "infraspinatus receives innervation from medial cutaneous nerve of the forearm." is false.
infraspinatus 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) teres major receives innervation from spinal segment C7.

This answer is incorrect.


The statement, "teres major receives innervation from spinal segment C7." is true.
teres major receives innervation from the brachial plexus, receives innervation from spinal segment C5, receives innervation from spinal segment C6, and receives innervation from spinal segment C7.  (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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