At the Anatomical Institute logistics and spatial relations were optimal for the surgical technical evaluation. All surgical instruments were available (e.g. electric Trepan, osseous saw, instruments, expendable items) to create a realistic simulation of the surgical approaches. The operations were performed on an anatomical section table; illumination was provided by the light of the Robotic Visualization System – ZEISS KINEVO 900. Delivery, setup and connection of the components were carried out exclusively by employees of Carl Zeiss Meditec AG. The examined cadavers were all deep-frozen human heads. On both days 10 cadaver heads were evaluated and then refrozen. Each head was taken out of the freezer 24 hours prior to examination, allowing adequate thawing time at room temperature. On the preparation, some icy patches were encountered, however the bony structures and cerebral membranes were intact. Cranial nerves were in a very good state and comparable with in vivo findings. Even though bloodless, preparation of vascular structures was authentic. The parenchyma of the brain of all specimens appeared clearly atrophied and partially liquefied. However, there was a wide variation in the state of preservation. In all approaches that are mainly intraparenchymal (above all the transcallosal approach) only well-preserved specimens were chosen. Once the ventricular system was entered, all anatomical structures could clearly be visualized.