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 pollicis longus receives innervation from anterior interosseous nerve.
 
        B) Supraspinatus receives innervation from the brachial plexus.
 
        C) Extensor carpi ulnaris receives innervation from spinal segment C8.
 
        D) Flexor digitorum profundus I receives innervation from spinal segment C1.
 
        E) Opponens pollicis 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) flexor pollicis longus receives innervation from anterior interosseous nerve.

This answer is incorrect.

The statement, "flexor pollicis longus receives innervation from anterior interosseous nerve." is true.
flexor pollicis longus 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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B) supraspinatus receives innervation from the brachial plexus.

This answer is incorrect.

The statement, "supraspinatus receives innervation from the brachial plexus." is true.
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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C) extensor carpi ulnaris receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "extensor carpi ulnaris receives innervation from spinal segment C8." is true.
extensor carpi ulnaris 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) flexor digitorum profundus I receives innervation from spinal segment C1.

This answer is correct.

The statement, "flexor digitorum profundus I receives innervation from spinal segment C1." is false.
flexor digitorum profundus I 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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E) opponens pollicis receives innervation from median nerve.

This answer is incorrect.

The statement, "opponens pollicis receives innervation from median nerve." is true.
opponens pollicis receives innervation from median 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
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