. The pathological anatomy of the ear . a, which fibres are, in the normalcondition, closely crow^led together on the peripheryof the membrane ; or else they are caused by a thick-ening of the mucous layer of the membrane, whichin this region possesses in the normal condition, villior papillae, as was first described by Gerlach. When these peripheral opacities are very wellmarked there always exists a simultaneous patholog-ical thickening of the tympanic mucous membrane,and it will be noticed that the central portion of themembrana tvmpani appears darker and more trans-parent than usual, and a
. The pathological anatomy of the ear . a, which fibres are, in the normalcondition, closely crow^led together on the peripheryof the membrane ; or else they are caused by a thick-ening of the mucous layer of the membrane, whichin this region possesses in the normal condition, villior papillae, as was first described by Gerlach. When these peripheral opacities are very wellmarked there always exists a simultaneous patholog-ical thickening of the tympanic mucous membrane,and it will be noticed that the central portion of themembrana tvmpani appears darker and more trans-parent than usual, and apparently or in reality iscurved deeper inwards than is natural. THE DRUM-MEMBRANE. G9 Calcifications in the membrana tympani are verycommon. They may occur as isolated affections with-out pathological changes in the deeper parts of theear and with a normal hearing ; more commonly theyare the remains of previous suppurative processes inthe ear, but they are also found in deaf persons withnon-suppurative inflammations of the middle
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Keywords: ., bookcentury1800, bookdecade1870, bookidpa, booksubjecteardiseases
