[Needle electromyography with sonographic control of needle position].

High resolution ultrasound provides excellent imaging of mimic muscles. In contrast to clinical examination, single muscles can be well defined and by real time imaging be observed during function. Since an EMG-needle electrode is also visible the puncture of small muscles or muscle-segments can be achieved with great exactness under sonographic control. The result of the electromyographic studies can, therefore, be related to individual muscles or muscle-segments.