A text-book of the diseases of the ear for students and practitioners . e Valsalvan experiment,and to display a distinct mobility during the examination withthe Siegle speculum. Such cicatrices sometimes become perforated in one or more 398 DISEASES OF THE EAR places, whereby the air can escape freely into the external meatus ;these perforations are probably caused by the repeated impact ofthe air while blowing the nose (Fig. 206). When the con-ditions are favourable, such cicatrices are easily diagnosed, if ablack orifice is visible behind the anterior ledge-shaped remnantof the membrane in t
A text-book of the diseases of the ear for students and practitioners . e Valsalvan experiment,and to display a distinct mobility during the examination withthe Siegle speculum. Such cicatrices sometimes become perforated in one or more 398 DISEASES OF THE EAR places, whereby the air can escape freely into the external meatus ;these perforations are probably caused by the repeated impact ofthe air while blowing the nose (Fig. 206). When the con-ditions are favourable, such cicatrices are easily diagnosed, if ablack orifice is visible behind the anterior ledge-shaped remnantof the membrane in the anterior part of the field of view(Fig. 207), through which babbles filled with air or mucusmake their appearance during the Valsalvan experiment. Theentrance into the mastoid antrum may also be occluded by sucha membranous septum, and become separated from the tympaniccavity; such a condition, however, can never be discovered byinspection. In those cases in which the entire inner surface of the retractedor flattened, thickened, parchment-like membrane is adherent.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectear, booksubjecteardi
