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) Teres major receives innervation from medial cutaneous nerve of the arm.
 
        B) Flexor digitorum profundus III receives innervation from radial nerve.
 
        C) Extensor digitorum receives innervation from spinal segment C8.
 
        D) Lumbricals IV receives innervation from spinal segment C5.
 
        E) Extensor pollicis brevis receives innervation from median 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) 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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B) flexor digitorum profundus III receives innervation from radial nerve.

This answer is incorrect.

The statement, "flexor digitorum profundus III receives innervation from radial 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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C) extensor digitorum receives innervation from spinal segment C8.

This answer is correct.

The statement, "extensor digitorum receives innervation from spinal segment C8." is true.
extensor digitorum receives innervation from radial nerve, receives innervation from posterior interosseous 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 C5.

This answer is incorrect.

The statement, "lumbricals IV receives innervation from spinal segment C5." 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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E) extensor pollicis brevis receives innervation from median nerve.

This answer is incorrect.

The statement, "extensor pollicis brevis receives innervation from median nerve." is false.
extensor pollicis brevis receives innervation from radial nerve, receives innervation from posterior interosseous nerve, receives innervation from spinal segment C7, and receives innervation from spinal segment C8.  (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