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 II receives innervation from spinal segment T1.
 
        B) Extensor digitorum receives innervation from posterior interosseous nerve.
 
        C) Flexor pollicis longus receives innervation from anterior interosseous nerve.
 
        D) Lumbricals II receives innervation from spinal segment C8.
 
        E) Infraspinatus receives innervation from axillary 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 II receives innervation from spinal segment T1.

This answer is incorrect.

The statement, "lumbricals II receives innervation from spinal segment T1." is true.
lumbricals II receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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B) extensor digitorum receives innervation from posterior interosseous nerve.

This answer is incorrect.

The statement, "extensor digitorum receives innervation from posterior interosseous nerve." 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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C) 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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D) lumbricals II receives innervation from spinal segment C8.

This answer is incorrect.

The statement, "lumbricals II receives innervation from spinal segment C8." is true.
lumbricals II receives innervation from median nerve, receives innervation from spinal segment C8, and receives innervation from spinal segment T1.  (See References)

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E) infraspinatus receives innervation from axillary nerve.

This answer is correct.

The statement, "infraspinatus receives innervation from axillary nerve." is false.
infraspinatus 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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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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