. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. being at times mis-taken for it. Lower down, the promontory is approachedor touched by the retracted membrane, and its roundedsurface may be very evident with the dark niche of theround window behind it. Inflation of the tympanummay wholly change this picture, as is shown in Figs. 4lit.)and 4196, where a drum-head greatly retracted, withmarked folds standing out prominently as they stretch tothe short process, and a manubrium drawn far up andback, becomes in a mo
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. being at times mis-taken for it. Lower down, the promontory is approachedor touched by the retracted membrane, and its roundedsurface may be very evident with the dark niche of theround window behind it. Inflation of the tympanummay wholly change this picture, as is shown in Figs. 4lit.)and 4196, where a drum-head greatly retracted, withmarked folds standing out prominently as they stretch tothe short process, and a manubrium drawn far up andback, becomes in a moment almost normal in position,except for the bulging outward of its stretched , too, in Figs. 4197 and 4198 the large, thin area whichis at one moment depressed into close contact with theunderlying structure, is blownout at another into a thin bel-lying sac protruding into themeatus. The malleus - handle beingforced inward with the depres-sion of the membrane or bythe tensor tympani, or both,the pressure will be conveyedthrough the malleo - incudaljoint and the incus to the stapes,and the foot-plate of this ossicle. being pressed unduly in upon Fig. 4196.—The Same Mem- the labyrinth, tinnitus and im- brana Tympani immediately paired hearing usually result. %£* the Inflation- CPolit-The interference with the stapes may also be caused directly, as we have seen, by contactof the membrane, which may envelop it so as greatly toimpede its proper movements. Relief of this pressuremay be accomplished promptly and satisfactorily by in-flation in many cases ; but in some the retraction of thetendon of the tensor cannot be thus combated, or theEustachian tube is not permeable. Tenotomy of the ten-sor tympani has been done at times with marked benefit,and in other cases the still simpler operation of dividingthe prominent posterior fold close behind the short pro-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
