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) Extensor pollicis brevis receives innervation from spinal segment C3.
 
        B) Flexor carpi ulnaris receives innervation from spinal segment C7.
 
        C) Deltoid receives innervation from spinal segment T1.
 
        D) Extensor pollicis brevis receives innervation from medial cutaneous nerve of the forearm.
 
        E) Lumbricals III receives innervation from spinal segment C1.
 

 

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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) extensor pollicis brevis receives innervation from spinal segment C3.

This answer is incorrect.

The statement, "extensor pollicis brevis receives innervation from spinal segment C3." 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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B) flexor carpi ulnaris receives innervation from spinal segment C7.

This answer is correct.

The statement, "flexor carpi ulnaris receives innervation from spinal segment C7." is true.
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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C) deltoid receives innervation from spinal segment T1.

This answer is incorrect.

The statement, "deltoid receives innervation from spinal segment T1." 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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D) extensor pollicis brevis receives innervation from medial cutaneous nerve of the forearm.

This answer is incorrect.

The statement, "extensor pollicis brevis receives innervation from medial cutaneous nerve of the forearm." 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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E) lumbricals III receives innervation from spinal segment C1.

This answer is incorrect.

The statement, "lumbricals III receives innervation from spinal segment C1." 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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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