Intraoperative neuromonitoring refers to monitoring of important functions of the nervous system during neurosurgical interventions. It is aimed at timely recognition of nerve structures impaired by intervention as well as localization of functionally important structures before the intervention. Depending on the structure and kind of intervention to be monitored, various procedures, partly simultaneous, are applied. Because of the intraoperative monitoring the surgeon obtains continuous feedback about the performance of the operated region. He can adjust his surgical strategy to the findings, so that maximum protection of important brain structures is ensured during the intervention.