The FrontalCortex question bank can help you study for the neurology boards.

Nerve Injuries Affecting the Upper Extremity

Topic: Pharmacology

Created on Friday, December 22 2006 by jdmiles

Last modified on Friday, December 22 2006.

A Greek female deity was gouged in the axilla by a Narwhal yesterday. She presents to your clinic today complaining of numbness in the area shaded in green in the image above. She also, as pictured, is unable to extend her arm at the elbow. Abduction at the shoulder has been spared. Of the following options, which muscles are likely to be weak?

 
        A) Extensor carpi radialis longus
 
        B) The dorsal interossei
 
        C) Pronator teres
 
        D) Biceps brachii
 
        E) Flexor digitorum superficialis
 

 


Back to the question = Go back to the top of the page.
See another question like this one = Reload a different version of this question ().
Click here for a random question = Load a random question from the database.
Clone this question = Use this question as a template to create a totally NEW question.
Rate this question = Enter detailed rating for this question!
Average user rating for this question = 5 = How users like you have rated this question.
This question was created on December 22, 2006 by jdmiles.
This question was last modified on December 22, 2006.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) extensor carpi radialis longus

This answer is correct.


The sensory and motor deficits this patient complains of are consistent with a radial nerve injury. The extensor carpi radialis longus is one of the muscles innervated by the radial nerve.   (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this questionAverage user rating for this question = 5
Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 




B) the dorsal interossei

This answer is incorrect.


The sensory and motor deficits this patient complains of are consistent with a radial nerve injury. The the dorsal interossei is not innervated by the radial nerve. It is innervated by the ulnar nerve.   (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this questionAverage user rating for this question = 5
Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 




C) pronator teres

This answer is incorrect.


The sensory and motor deficits this patient complains of are consistent with a radial nerve injury. The pronator teres is not innervated by the radial nerve. It is innervated by the median nerve.   (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this questionAverage user rating for this question = 5
Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 




D) biceps brachii

This answer is incorrect.


The sensory and motor deficits this patient complains of are consistent with a radial nerve injury. The biceps brachii is not innervated by the radial nerve. It is innervated by the musculocutaneous nerve.   (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this questionAverage user rating for this question = 5
Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 




E) flexor digitorum superficialis

This answer is incorrect.


The sensory and motor deficits this patient complains of are consistent with a radial nerve injury. The flexor digitorum superficialis is not innervated by the radial nerve. It is innervated by the median nerve.   (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this questionAverage user rating for this question = 5
Please log in if you want to rate questions.

 

 

 

 

References:

1. Preston, D.C., and Shapiro, B.E. (2005). Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, 2nd Edition. Elsevier, Philadelphia. Pp. 663-666.
2. Bickley, L.S., and Hoekelman, R.A. (1999). Bates' Guide to Physical Examination and History taking, 7th Edition. Lippincott, Philadelphia. Pp. 163-244.
Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this questionAverage user rating for this question = 5
Please log in if you want to rate questions.

 

FrontalCortex.com -- Neurology Review Questions -- Neurology Boards -- Board Review -- Residency Inservice Training Exam -- RITE Exam Review
pharmacology
Nerve Injuries Affecting the Upper Extremity
Question ID: 12220600
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 12/22/2006
Modified: 12/22/2006
Estimated Permutations: 932083200

User Comments About This Question:

0 user entries
Please log in if you'd like to add a comment.