A text-book of the diseases of the ear for students and practitioners . sion. If the retracted but still lustrous mem-brane becomes dim, gray, and non-transparent after an inflation CONDITION OF THE MEMBRANE IN CATARRH 257 of air, the exudate and the bubbles will not be seen. This con-dition is similar to that seen in those cases in which the tympaniccavity is full of secretion, and in which the diagnosis cannot bemade by inspection, because the membrana tympani has becomecloudy and opaque owing to a long continuation of the catarrh. The curvature of the membrana tympani in recent cases ofsero
A text-book of the diseases of the ear for students and practitioners . sion. If the retracted but still lustrous mem-brane becomes dim, gray, and non-transparent after an inflation CONDITION OF THE MEMBRANE IN CATARRH 257 of air, the exudate and the bubbles will not be seen. This con-dition is similar to that seen in those cases in which the tympaniccavity is full of secretion, and in which the diagnosis cannot bemade by inspection, because the membrana tympani has becomecloudy and opaque owing to a long continuation of the catarrh. The curvature of the membrana tympani in recent cases ofsero-mucous catarrh seldom shows any noticeable deviation fromthe normal. On the other hand, in those chronic catarrhsassociated with impermeability of the tube, the membrane isforced inwards by the excess of the external atmosphericpressure. While the handle of the malleus is retracted inwardsand backwards, and thereby appears as if it were shortened, theprocessus brevis and posterior fold of the membrane projectmarkedly outwards (Figs. 116 and 117). In these cases, the. Fig. 114.—Accumulation of a Con-siderable Quantity of Exuda-tion in the Tympanic Cavity, ina Man with a Chronic Catarrhof the Naso-Pharynx. The line of the fluid level is visible onlyin front of the handle of the of the exudation by paracen-tesis of the membrana tympani.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectear, booksubjecteardi
