. The pathological anatomy of the ear . t of the membrane in the intermediar zonebetween the manubrium and the tendinous tympanicring; are most rare immediately at the manubrium orperiphery because at these spots the lamina propriais most strongly developed and offers the greatest re-sistance to destructive processes (Politzer). Perfora-tions in the extreme upper portion of the membrane,in the so-called membrana flaccid a Shrapneli, wherethere is no lamina propria, are by no means rare. The size of perforations vary from that of a fineneedle to a loss of the whole membrane. Most com-monly a Y
. The pathological anatomy of the ear . t of the membrane in the intermediar zonebetween the manubrium and the tendinous tympanicring; are most rare immediately at the manubrium orperiphery because at these spots the lamina propriais most strongly developed and offers the greatest re-sistance to destructive processes (Politzer). Perfora-tions in the extreme upper portion of the membrane,in the so-called membrana flaccid a Shrapneli, wherethere is no lamina propria, are by no means rare. The size of perforations vary from that of a fineneedle to a loss of the whole membrane. Most com-monly a Y shaped portion of the membrane remainsabove and around the manubrium and a falciformremnant on the periphery. The most common shape of perforations is round, THE DRUM-MEMBRANE. 77 oval, elliptical, or kidney-shaped. With a central per-foration the exposed manubrium is drawn inwards bythe tension of the tendon of the tensor tympani mus-cle, and lies near or directly against the promon-tory ; in many cases it is even drawn so far inwards. Fig. 36. Fig. 37. Fig. 38.
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Keywords: ., bookcentury1800, bookdecade1870, bookidpa, booksubjecteardiseases
