. The pathological anatomy of the ear . as flattening or asincreased concavity (drawing inwards) of the drum-membrane. Convex j^^ojectlons, the result of inflammatoryswelling with acute catarrh of the tympanum, seldominvolve the wdiole extent of the membrane. Themembrana tympani projects in the shape of a hemi-sphere, is bluish-red, moist and glis-tening, resembling the surface of asmooth polypus. With this condi-tion of the drum-membrane, theposition of the manubrium may beindicated by a groove between theanterior and posterior segments of ps 35. the projection. Bladder-Uke Piotnision . . pi
. The pathological anatomy of the ear . as flattening or asincreased concavity (drawing inwards) of the drum-membrane. Convex j^^ojectlons, the result of inflammatoryswelling with acute catarrh of the tympanum, seldominvolve the wdiole extent of the membrane. Themembrana tympani projects in the shape of a hemi-sphere, is bluish-red, moist and glis-tening, resembling the surface of asmooth polypus. With this condi-tion of the drum-membrane, theposition of the manubrium may beindicated by a groove between theanterior and posterior segments of ps 35. the projection. Bladder-Uke Piotnision . . pi ^^^ Posterior Upper Jrartial IWOjectlOnS of the mem- Quadrant; from collection brane are very common from collec- f ^° ^^^^^^^ •^ tympani. tion of exudation in the tympanum,and also during acute myringitis ; they are most com-mon near the periphery and on the upper half of themembrane, often appearing as bladder-like projectionson the periphery of the posterior upper are also produced by granulations, 74 PATHOLOGY OF THE EAR. and abscesses in the clrmn-memlDrane. by the collectionof pus, mucus, caseous and epidermal masses behindthe membrane, and by polypi within the tympanum. The granulations of the membrana tympani connective-tissue growths of the cutis layer,and certain portions or even the whole membranemay be thus affected. They are more common duringotitis media purulenta with perforation than duringchronic otitis externa, without perforation. The partial projections of the drum-membrane,which are sometimes produced by collections of airunder its skin, and by hernial openings in the mem-brane, will be considered with atrophy of the mem-brane. Flattening, by which the drum-membrane loses itsnormal concavity around the umbo, and appears as aflat disk, results, 1. From swelling of its layer ofskin, which often occurs with swelling of the layerof mucous membrane; 2. From collections of exuda-tion behind the membrane ; 3. From ina
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Keywords: ., bookcentury1800, bookdecade1870, bookidpa, booksubjecteardiseases
