Up to this time, there are only few anatomical studies regarding the nervus intermedius (NI). Clinical trials reveal a high percentage of intraoperative NI injury. Electrophysiological studies suggest an unknown, motoric function of the NI. Eighty-six brainstem sites were examined. The Obersteiner-Redlich-zone (ORZ) was explored and measured under the light microscope. Transverse sections of the NI were analyzed morphometrically. A classification synopsizes the different origins of the NI bundles. Along the nerve course, up to 1.3 mm from brainstem oligodendrocytes could be detected. Furthermore, fibers were found satisfying the morphologic criteria of motoric nerve fibers. This dissertation provides systematic anatomical knowledge being useful for cerebellopontine angle surgery. Data of the ORZ could help diagnose NI-neuralgia and plan the operative therapy. The results of this dissertation also indicate a motoric function of the NI.