Nerve Stimulator
 

 

The nerves are usually located using a nerve stimulator, a device that generates small impulses of electrical current. When the tip of the needle comes close to the nerves, the electrical current stimulates the nerves. This results in either a tingling sensation that travels down the arm, an involuntary twitching of the muscles of the arm or shoulder, or both.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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