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Full text of "Diseases Of The Nose Throat And Ear"

340

THE EAR

Fig, 174. Radical mastoid operation. A, Skin incision. B, Area of operation exposed. C, Mastoid
antrum opened. 0, Outer or lateral part of posterior bony meatal wall removed, but inner end, or
bndge, remains. Drumhead is visible. E, Most of the bridge has now been removed, body of the incus
and head of the malleus are revealed. F, Radical operation completed. Malleus and incus, with the
drumhead, have been removed, and facial spur lowered. Prominence of lateral canal, facial nerve,
stapes, promontory and the niche leading to the round window can all be seen on medial wall of
operation cavity.