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) Lumbricals IV receives innervation from median nerve.
 
        B) Flexor digitorum profundus II receives innervation from spinal segment C5.
 
        C) Teres major receives innervation from medial cutaneous nerve of the arm.
 
        D) Pectoralis major receives innervation from posterior interosseous nerve.
 
        E) Brachialis receives innervation from musculocutaneous nerve.
 

 

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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) lumbricals IV receives innervation from median nerve.

This answer is incorrect.

The statement, "lumbricals IV receives innervation from median 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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B) flexor digitorum profundus II receives innervation from spinal segment C5.

This answer is incorrect.

The statement, "flexor digitorum profundus II receives innervation from spinal segment C5." is false.
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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C) teres major receives innervation from medial cutaneous nerve of the arm.

This answer is incorrect.

The statement, "teres major receives innervation from medial cutaneous nerve of the arm." is false.
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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D) pectoralis major receives innervation from posterior interosseous nerve.

This answer is incorrect.

The statement, "pectoralis major receives innervation from posterior interosseous nerve." is false.
pectoralis major receives innervation from the brachial plexus, receives innervation from spinal segment C5, 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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E) brachialis receives innervation from musculocutaneous nerve.

This answer is correct.

The statement, "brachialis receives innervation from musculocutaneous nerve." is true.
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
Estimated Permutations: 0