A text-book of the diseases of the ear and adjacent organs . Fig. 222. —Frontal Section throughthe Meatus and Membrana Tym-pani after a Middle - ear Sup-puration, with persistent Per-foration in the Membrane. m, Head of the hammer ; um, Stumpof the neck of the hammer;t, Lower part of remaining mem-brane ; p, Perforation in the mem-brane ; ep, Epidermis of osseous whispered speech could be still un-meatus; eP ep External epi- derstood at a great distance, provided dermis extending through the open- ° r ing into the cavum tympani. the foot-plate of the stapes was mov- able, and the membrane of t
A text-book of the diseases of the ear and adjacent organs . Fig. 222. —Frontal Section throughthe Meatus and Membrana Tym-pani after a Middle - ear Sup-puration, with persistent Per-foration in the Membrane. m, Head of the hammer ; um, Stumpof the neck of the hammer;t, Lower part of remaining mem-brane ; p, Perforation in the mem-brane ; ep, Epidermis of osseous whispered speech could be still un-meatus; eP ep External epi- derstood at a great distance, provided dermis extending through the open- ° r ing into the cavum tympani. the foot-plate of the stapes was mov- able, and the membrane of thefenestra rotunda was not thickened. In these cases hearing isaffected by the waves of sound falling immediately upon themovable foot-plate of the stapes. In the case of permanent per-forations it may, therefore, always be inferred from the existenceof a good hearing-distance, that the mobility of the stapes hasnot been impaired by the purulent process. But in the case of PERMANENT PERFORATIONS OF THE MEMBRANA TYMPANI. 389
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
