An illustrated atlas of anatomical aspects important for combinations of microsurgical and endoscopic approaches. The basis for Professor Seeger 's renowned drawings has been anatomical preparations, cadaver dissections and intraoperative pictures. The correct proportions are derived by measuring the distances of anatomical landmarks of cranial preparations and from CT and MR Images. A concise text supports the understanding of the anatomical figures. Numerous common anatomical variants are demonstrated with reference to their impact for the surgical technique.