. The pathological anatomy of the ear . sels are enlarged. The substantiapropria shows a peculiar swelling and softening ofthe fibres from which the drum-membrane assumes asoft relaxed condition, and is very easily torn. Themeatus near the membrana tympani, if not originallyaffected, participates secondarily in the inflammation,the sharp boundary between the meatus and drum-membrane disappears, and the membrane itself lookssmaller than natural on account of the swelling of themeatus. Sometimes ecchymoses and interlamellar abscessesoccur in the membrane. In veryrare cases perforating ulcers are
. The pathological anatomy of the ear . sels are enlarged. The substantiapropria shows a peculiar swelling and softening ofthe fibres from which the drum-membrane assumes asoft relaxed condition, and is very easily torn. Themeatus near the membrana tympani, if not originallyaffected, participates secondarily in the inflammation,the sharp boundary between the meatus and drum-membrane disappears, and the membrane itself lookssmaller than natural on account of the swelling of themeatus. Sometimes ecchymoses and interlamellar abscessesoccur in the membrane. In veryrare cases perforating ulcers arefound. (Fig. 30.) Acute diseases of the skin ofthe meatus sometimes extend onto the skin of the drum-mem-brane, and the vesicles of eczema?2 ^° and pemphigus have been seen on An Ulcer perfovatinsr from •, -r ^ xl ^ 1,1,,„ without inward, in the central it- I haVC UCVCr SCCH the plllyC-portion of tlie drum membrane, teuular foHU of myringitis OCCUr- ring with scrofula as it is described by Triquet.^ Pos- 1 Presse Med., 1863, THE DRUM-MEMBRANE. 65 sibly this is owing to its being confounded with vesic-ular prominences of the skin or with the vesicles ofeczema. The chronic inflammation of the membrana tym-pani, which comes under observation frequently, isalso seldom an isolated disease, but is usually only anaccompaniment of simultaneous inflammation of thetympanum. The membrane is covered with pus, isthickened, flattened, of a yellowish gray color, withradiating varicose blood-vessels, and occasionall} withpolypoid excrescences. No part of the hammer,except perhaps the processus brevis, can be recog-nized. In the substantia propria there are depositsof fat and lime, in the mucous membrane infiltrationwith round cells; cysts also are sometimes formed. The walls of the meatus are, in their external half,of nearly normal appearance, in their inner half, nearthe drum-membrane, usually covered with black crusts,but nowhere with fresh pus. The myringitis parasitica (myringom
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Keywords: ., bookcentury1800, bookdecade1870, bookidpa, booksubjecteardiseases
