The history of clinical application of electromyographic and electroneurographic techniques is not even 60 years old. For a long time the clinicians' need could not be fulfilled, due to the imperfection of the electronic equipment. Nowadays, electromyography and electroneurography are established methods not only for the diagnosis of neuromuscular disorders, but since the recording of cortical and spinal evoked potentials has been introduced, diseases of the central nervous system lie also within its scope.