i dont know about being able to determine through an emg if the cervical spine is involved in causing your pn, but i have herniations in my lumbar and cervical and during an emg/ncs, i was tested in the area of the lower back and they told me the lumbar was not a cause of my pn in my legs. A few years later i had an epidural steroid injection in my cervical spine as a diagnostic/treatment for the pn in my hands/lower arms which didnt help by the way. It actually made my feet feel worse, electrical shock, stabbing pain wise, but didnt make my hands or lower arms feel any different. I dont understand it but that is what happened.