A text-book of the diseases of the ear and adjacent organs . ear as residue of the fcetal mucous membranecushion (Fig. 122). In some rare cases such striae are transformed by a * Steinbriigge, Pathologitche Anatomie dta Ohres, in Zieglers Patholog. Anatomie,1890. 278 THE CATARRHAL ADHESIVE PROCESSES IN THE MIDDLE EAR. deposit of calcareous salts into bone-like processes (Toynbee, v. Troltsch).We further find circumscribed or extensive adhesions between the membranatympani and the inner wall of the tympanic cavity, and sometimes a partialor complete obliteration of the attic of the whole cavum
A text-book of the diseases of the ear and adjacent organs . ear as residue of the fcetal mucous membranecushion (Fig. 122). In some rare cases such striae are transformed by a * Steinbriigge, Pathologitche Anatomie dta Ohres, in Zieglers Patholog. Anatomie,1890. 278 THE CATARRHAL ADHESIVE PROCESSES IN THE MIDDLE EAR. deposit of calcareous salts into bone-like processes (Toynbee, v. Troltsch).We further find circumscribed or extensive adhesions between the membranatympani and the inner wall of the tympanic cavity, and sometimes a partialor complete obliteration of the attic of the whole cavum tympani. by trans-formation of its excessively proliferated mucous membrane into connectivetissue, and its complete and general union with the inner surface of themembrana tympani and the covering of the ossicula. Through these alterations in the tympanic cavity, the power of vibration ofthe conducting apparatus is more or less impaired. The greatest obstacles toconduction arise from the intimate attachment of the ossicula to the walls of the ? L* ^—s\. Fig. 124.—Adhesion of the Cruba of the Stapes with the Lower Wall ofthe Pelvis Ovalis, from the Left Ear or a Woman aged 48 Years, who GRADUALLY GREW DEAF, THE LEFT Ear DATING SINCE 20 YEARS, THE RlGHT 10 Years. Microscopical Section through the Pelvis Ovalis and theCrura of the Stapes. p, Pelvis ovalis; o, Upper wall of the niche; n, Mucous membrane of the lowerwall of the niche, which is infiltrated with fibrous sclerosed connective tissue ;8f, sl, Sections of crurse of the stapes covered with tough fibrous connective tissue.(After a preparation in my collection.) tympanic cavity and from anchylosis of the ossicular joints. This anchylosisis due to the formation either of a tense fibrous tissue (anchylosis membranaceas. spuria), or of osseous substance (anchylosis ossea s. vera). The anchylosisaffects either all the ossicula, or each of them may be separately united with theadjoining walls of the tympanic cavity. We rind,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
