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) Flexor carpi ulnaris receives innervation from axillary nerve.
 
        B) The dorsal interossei receives innervation from the brachial plexus.
 
        C) Supraspinatus receives innervation from spinal segment C1.
 
        D) Extensor pollicis brevis receives innervation from posterior interosseous nerve.
 
        E) Extensor indicis receives innervation from ulnar 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) flexor carpi ulnaris receives innervation from axillary nerve.

This answer is incorrect.

The statement, "flexor carpi ulnaris receives innervation from axillary 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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B) the dorsal interossei receives innervation from the brachial plexus.

This answer is incorrect.

The statement, "the dorsal interossei receives innervation from the brachial plexus." is false.
the dorsal interossei 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 spinal segment C1.

This answer is incorrect.

The statement, "supraspinatus receives innervation from spinal segment C1." 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) extensor pollicis brevis receives innervation from posterior interosseous nerve.

This answer is correct.

The statement, "extensor pollicis brevis receives innervation from posterior interosseous nerve." is true.
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) extensor indicis receives innervation from ulnar nerve.

This answer is incorrect.

The statement, "extensor indicis receives innervation from ulnar nerve." is false.
extensor indicis 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