“…(Adult, 66 years old.) Redrawn after photomicrograph (DIETZEL 1961, KETTEL 1963, SAMMUT 1967, SHAMBAUGH 1967, LEONARD & ALEXANDER 1968, BAXTER 1971, SCHUKNECHT 1971. In adhesive processes and tympanosclerosis the facial nerve may be injured by inadvertent instrumentation if large defects are present.…”