A text-book of the diseases of the ear for students and practitioners . mm. in thickness was found on the innersurfaces of the saccule and utricle, in the cochlea, and in the semicircularcanals. The post-mortem examinations made by the author show that thepathological changes (exudation, formation of connective tissue and bone)occur most frequently in the scala tympani of the cochlea. According toSteinbriigge, the first turn of the cochlea is that part of the labyrinth whichundergoes the most intense changes. 9 Cp. Mygind, Ein Fall von einseitir/er, totaler Abivesenheit <les Laby-rinthes, v
A text-book of the diseases of the ear for students and practitioners . mm. in thickness was found on the innersurfaces of the saccule and utricle, in the cochlea, and in the semicircularcanals. The post-mortem examinations made by the author show that thepathological changes (exudation, formation of connective tissue and bone)occur most frequently in the scala tympani of the cochlea. According toSteinbriigge, the first turn of the cochlea is that part of the labyrinth whichundergoes the most intense changes. 9 Cp. Mygind, Ein Fall von einseitir/er, totaler Abivesenheit <les Laby-rinthes, verursacht durch scarlatinose Otitis intima ( 0., vol. xxiii.). SECONDARY INFLAMMATION OF THE LABYRINTH 745 The disturbances of hearing which are the sequelae of meningitispurulenta or of meningitis cerebro-spinalis epidemica, must bereckoned to the secondary inflammations of the are, on the whole, seldom met with as the result of aprimary meningitis which has run its course. The anatomicalconditions giving rise to the deafness have been shown to be. Fig. 329. — Frontal Section through the Eight Vestibule andUtricle of a Deaf Woman, aged 93 Years, in whom Cholesteato-matous Masses were found in the External Meatus and in theTympanic Cavity. Stapes movable. st, Footplate of the stapes ; u, Utricle ; I, Cisterna perilymphatica ; n, Section ofthe utricular nerve ; p, Promontory with epithelial growths on its vestibularsurface ; m, Epithelial growth on the inner side of the macuhe acusticae utriculi;b, Prominence of the epithelial layer on the floor of the utricle. due to purulent inflammation of the ependyma and softeningof the floor of the fourth ventricle, to purulent infiltration,fatty degeneration and atrophy of the root of the acoustic nerve,and to purulent inflammation of the labyrinth. The deafness arising in the course of the primary form ofmeningitis becomes evident either immediately after the return of 746 DISEASES OF THE EAR consciousness, between t
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