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8a: (OR) The labyrinth (Lb) is located at the end of the mastoidectomy. Middle fossa dura (MD). Sigmoid sinus (SS). Digastric ridge (DR). 8 b: (OR) The labyrinthectomy is carried out. Here the superior semicircular (SSC) and its membranous labyrinth are opened. Middle fossa dura (MD). 8c: (OR) The ampulla of the superior semicircular canal (aSSC) is opened and kept as landmark for the fundus. Middle fossa dura (MD). Sigmoid sinus (SS). Digastric ridge (DR).
