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Upper extremity muscle function and innervation 03

Topic: Anatomy

Created on Monday, August 18 2008 by jdmiles

Last modified on Monday, August 18 2008.

During a needle EMG of the upper extremity, you notice a large number of fibrillations in the first dorsal interosseous muscle while the patient is at rest. From this, you deduce that the patient has a lesion. Of the following options, which lesion is most compatible with the EMG findings?

 
        A) A C7 radiculopathy
 
        B) A C8 radiculopathy
 
        C) A cervical spinal cord lesion
 
        D) A lesion in the median nerve
 
        E) A stroke
 

 


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This question was created on August 18, 2008 by jdmiles.
This question was last modified on August 18, 2008.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS



A) a C7 radiculopathy

This answer is incorrect.


The fibrillations suggest an active peripheral nerve lesion. The abductor pollicis brevis muscle receives innervation from the ulnar nerve, the medial cord, the lower trunk, and the C8 and T1 nerve roots.  (See References)

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B) a C8 radiculopathy

This answer is correct.


The fibrillations suggest an active peripheral nerve lesion. The abductor pollicis brevis muscle receives innervation from the ulnar nerve, the medial cord, the lower trunk, and the C8 and T1 nerve roots.  (See References)

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C) a cervical spinal cord lesion

This answer is incorrect.


The fibrillations suggest an active peripheral nerve lesion. The abductor pollicis brevis muscle receives innervation from the ulnar nerve, the medial cord, the lower trunk, and the C8 and T1 nerve roots.  (See References)

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D) a lesion in the median nerve

This answer is incorrect.


The fibrillations suggest an active peripheral nerve lesion. The abductor pollicis brevis muscle receives innervation from the ulnar nerve, the medial cord, the lower trunk, and the C8 and T1 nerve roots.  (See References)

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E) a stroke

This answer is incorrect.


The fibrillations suggest an active peripheral nerve lesion. The abductor pollicis brevis muscle receives innervation from the ulnar nerve, the medial cord, the lower trunk, and the C8 and T1 nerve roots.  (See References)

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References:

1. Preston, D.C., and Shapiro, B.E. (2005). Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, 2nd Edition. Elsevier, Philadelphia. (ISBN:075067492X)Advertising:
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anatomy
Upper extremity muscle function and innervation 03
Question ID: 081808097
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 08/18/2008
Modified: 08/18/2008
Estimated Permutations: 198000

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