A text-book of the diseases of the ear and adjacent organs . be employed, if in a given case the symptomsdenote localized swelling and impermeability of the tube. Appearance of the Membrana Tympani.—The appearance of themembrana tympani in the sero-mucous catarrhs of the middle ear THE SECRETING FORM OF MIDDLE-EAR CATARRH. 255 presents many varieties, which depend partly on the duration ofthe affection, partly on the transparency of the membrane, on thequantity, character, and colour of the exudation, and on the amountof blood-supply in the mucous membrane of the tympanic cavity. When the memb
A text-book of the diseases of the ear and adjacent organs . be employed, if in a given case the symptomsdenote localized swelling and impermeability of the tube. Appearance of the Membrana Tympani.—The appearance of themembrana tympani in the sero-mucous catarrhs of the middle ear THE SECRETING FORM OF MIDDLE-EAR CATARRH. 255 presents many varieties, which depend partly on the duration ofthe affection, partly on the transparency of the membrane, on thequantity, character, and colour of the exudation, and on the amountof blood-supply in the mucous membrane of the tympanic cavity. When the membrana tympani is transparent, the accumulationof serous or mucous exudation in the tympanic cavity, as I firstobserved and described,* can be distinguished by a peculiar appear-ance of the membrane. For the fluid can be seen through themembrane in the dependent portions of the tympanic cavity, itslevel being sharply defined from the air-filled portion of thetympanum by a line on the membrane. The line of demarcation, which is sometimes dark-gray or black,.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecteardiseases, bookyear
