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Sensory innervation of the upper extremity 04

Topic: Anatomy

Created on Friday, January 25 2008 by jdmiles

Last modified on Friday, January 25 2008.

During a neurologic exam, you apply pressure to a patient's 5th finger, and he tells you that he is able to feel it normally. In general, this suggests that which of the following peripheral structures are intact?

 
        A) Ulnar nerve, posterior cord of the brachial plexus, and C7 spinal nerve
 
        B) Ulnar nerve, posterior cord of the brachial plexus, and C5 spinal nerve
 
        C) Ulnar nerve, medial cord of the brachial plexus, and C8 spinal nerve
 
        D) Median nerve, medial cord of the brachial plexus, and C8 spinal nerve
 
        E) Radial nerve, posterior cord of the brachial plexus, and C5 spinal nerve
 

 


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This question was created on January 25, 2008 by jdmiles.
This question was last modified on January 25, 2008.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) ulnar nerve, posterior cord of the brachial plexus, and C7 spinal nerve

This answer is incorrect.


The posterior cord does not typically provide sensation to the 5th finger. C7 does not typically provide sensation to the 5th finger.   (See References)

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B) ulnar nerve, posterior cord of the brachial plexus, and C5 spinal nerve

This answer is incorrect.


The posterior cord does not typically provide sensation to the 5th finger. C5 does not typically provide sensation to the 5th finger.   (See References)

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C) ulnar nerve, medial cord of the brachial plexus, and C8 spinal nerve

This answer is correct.


Sensation from the 5th finger is generally carried by the ulnar nerve, medial cord, and C8 spinal nerve.   (See References)

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D) median nerve, medial cord of the brachial plexus, and C8 spinal nerve

This answer is incorrect.


The median nerve does not typically provide sensation to the 5th finger.   (See References)

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E) radial nerve, posterior cord of the brachial plexus, and C5 spinal nerve

This answer is incorrect.


The posterior cord does not typically provide sensation to the 5th finger. The radial nerve does not typically provide sensation to the 5th finger. C5 does not typically provide sensation to the 5th finger.   (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. (ISBN:0702025127) Advertising:
2. Biller, J. (2005). Practical Neurology DVD Reveiew. Lippincott Williams & Wilkins, Philadelphia. (ISBN:0781757533) Advertising:
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anatomy
Sensory innervation of the upper extremity 04
Question ID: 01250806
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 01/25/2008
Modified: 01/25/2008
Estimated Permutations: 6283200

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