A text-book of the diseases of the ear for students and practitioners . ion is recognised onlyby a depression with a pulsating light reflex, or by the appear-ance of pus during condensation of the air in the externalmeatus. Perforations in the anterior inferior quadrant of themembrane are often hidden by the bulging anterior wall of themeatus, and are discovered only by the presence of air-bubblesat the anterior inferior part of the field of vision, brought abouteither by the condensation of the air in the middle ear, or bythe rarefaction of the air in the external meatus. As a rule, there is
A text-book of the diseases of the ear for students and practitioners . ion is recognised onlyby a depression with a pulsating light reflex, or by the appear-ance of pus during condensation of the air in the externalmeatus. Perforations in the anterior inferior quadrant of themembrane are often hidden by the bulging anterior wall of themeatus, and are discovered only by the presence of air-bubblesat the anterior inferior part of the field of vision, brought abouteither by the condensation of the air in the middle ear, or bythe rarefaction of the air in the external meatus. As a rule, there is only one perforation in the membrane;still, one occasionally finds, especially in tubercular middle-ear suppurations, two (Figs. 168 and 169) and three (Fig. 165)apertures, which vary in form and size. Cases are quite rare inwhich the membrane is perforated in four (Bing) or more places,or in which it is pierced like a sieve by numerous small holes ;this latter condition is met with in diphtheritic and tubercularsuppurations of the middle ear* (Bonnafont, Schwartze)..
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