. Diseases of the ear; a text-book for practitioners and students of medicine. either the horizontal semicir-cular canal or the aqtfseductus Fallopii must be injured. Thepoint which the operator should remember is to follow inward along the level of the inferior wall of themeatus for about twothirds of the length ofthis channel, while thebony tissue can be re-moved along the up-per wall until theaditus ad antrum isreached. When this tri-angular or really quad-rilateral piece of bonehas been removed, thesurgeon will be ableto see distinctly theprominence of thehorizontal semicircularcanal and t
. Diseases of the ear; a text-book for practitioners and students of medicine. either the horizontal semicir-cular canal or the aqtfseductus Fallopii must be injured. Thepoint which the operator should remember is to follow inward along the level of the inferior wall of themeatus for about twothirds of the length ofthis channel, while thebony tissue can be re-moved along the up-per wall until theaditus ad antrum isreached. When this tri-angular or really quad-rilateral piece of bonehas been removed, thesurgeon will be ableto see distinctly theprominence of thehorizontal semicircularcanal and the facialcanal, and close inspec-tion will reveal below this the oval window. After these stepsof the operation have been accomplished, the operator will thenbreak away the floor of the tympanic vault—that is, the innerextremity of the superior wall of the external auditory procedure, when completed, will disclose the entire middle-ear cavity as continuous with the external auditory canal; thehead and neck of the malleus with the short and long process will 37. Fig. 146.—Specimen showing appearance of bonycavity after the complete radical operation.(Authors specimen.) 552 RADICAL OPERATION FOR CHRONIC OTORRHCEA. be readily seen, and below this possibly the remnants of the tym-panic membrane. The body of the incus, with its short processin the sella incudis and its long- process extending downward tothe incudo-stapedial articulation, will also be made out. Abovethe head of the stapes the operator will see the prominentridge which constitutes the aquaaductus Fallopii, and just abovethis, and often continuous with it, the prominence of the hori-zontal semicircular canal. It is then simple, after this thoroughexposure of the parts, to divide the incudo-stapedial articu-lation, if this is still intact, and to remove the malleus, incus,and any remnants of the drum membrane. All of this canbe done without disturbing the stapes. After the ossicles have been removed, the
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