A text-book of the diseases of the ear and adjacent organs . nus rhomboideus. It cannot always be decided from the anatomical conditions whether thedeafness is congenital or acquired. Only with marked restrictions of forma-tion in the ear can it be said that a case is congenital deafness with the other hand, it is often impossible to say with a lack of reliable historywhether certain changes—for example, anchylosis of the ossicular, hyperostoseson the fenestrae of the labyrinth, connective tissue and osseous new growthsin the labyrinth—date from intra-uterine life or occurred afte
A text-book of the diseases of the ear and adjacent organs . nus rhomboideus. It cannot always be decided from the anatomical conditions whether thedeafness is congenital or acquired. Only with marked restrictions of forma-tion in the ear can it be said that a case is congenital deafness with the other hand, it is often impossible to say with a lack of reliable historywhether certain changes—for example, anchylosis of the ossicular, hyperostoseson the fenestrae of the labyrinth, connective tissue and osseous new growthsin the labyrinth—date from intra-uterine life or occurred after birth. Holger-Mygind calls attention to the relative frequency of the diseases ofthe labyrinth and the frequent association of the semicircular canals. Of the changes present in the labyrinth of deaf-mutes are to be mentioned :thickening of the membrane lining the osseous labyrinth, hyperostoticnarrowing of the vestibule and semicircular canals, thickening of the vesiclesof the vestibules, colloid degeneration of the nerve epithelium in the utriculus. (Moos and Steinbriigge), partial or total obliteration of the labyrinth cavitythrough connective tissue and osseous new growth (Moos and Steinbriigge,Habermann, Burckhardt-Merian, Politzer), atrophy of the nerve termina-tion in the cochlea (Scheibe) and in the ganglion layer of Kosenthals canal(Politzer), defect in the organ of Corti and the changes already describedafter cerebro-spinal meningitis (Habermann). Besides the anatomical changes already described by me in deaf-mutes,there still remain two interesting conditions to be mentioned. In aman 61 years of age, said to have been born deaf and dumb, the followingconditions were noted : a normal state of the external and middle ears, themembrane of the fenestra rotunda very thin and very movable; hydro-cephalus internus chronicus; pachymeningitis chronica; striae acusticaefaintly developed; the stem of the left auditory nerve was gelatinously de-generated.—In a girl, elev
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
