. The pathological anatomy of the ear . hey are alwayscovered with a pavement epithelium, and that theycontain neither glands nor cysts like the polypi ofthe middle ear, although like these latter they mayhave a papillary structure. Polypi of the meatus aremuch more rare than polypi of the middle ear, butdo occur with an imperforate drum-membrane. Some-times, however, they exist simultaneously with puru-lent inflammation of the middle ear. For a more minute account of aural polypi, com-pare the chapter on the tympanum. Exostoses,^ congenital or acquired, pedunculated orw^ith a broad base, spon
. The pathological anatomy of the ear . hey are alwayscovered with a pavement epithelium, and that theycontain neither glands nor cysts like the polypi ofthe middle ear, although like these latter they mayhave a papillary structure. Polypi of the meatus aremuch more rare than polypi of the middle ear, butdo occur with an imperforate drum-membrane. Some-times, however, they exist simultaneously with puru-lent inflammation of the middle ear. For a more minute account of aural polypi, com-pare the chapter on the tympanum. Exostoses,^ congenital or acquired, pedunculated orw^ith a broad base, spongy or eburnated, are eburnated may bedeveloped from thespongy variety, and per-haps vice versa. Bothare only diiferent stagesof development of thesame process. Theirseat is generally at thebeginning of the osse-ous meatus or close tothe membrana tympani, usually on the upper calibre of the meatus may be almost or evenwholly destroyed by them, but as long as a slit evenremains open no disturbance of the hearing is no-. Fig. of the Meatus. From Welcker,A. f. O., i., Table 2, Fig. 7. ^ C. O. Weber, Die Exostosen und Enchondromen, Bonn, 1856. Welcker,: 0., l, S. 163, 1864. 52 PATHOLOGY OF THE EAR. ticed. It very easily occurs, however, under suchconditions, that the glandular secretion and the scalesof epidermis are collected and retained behind or be-tween the exostoses, and thus hermetically close themeatus. From the pressure of the exostoses againstthe opposite wall, painful inflammation of the meatus
Size: 1874px × 1333px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidpa, booksubjecteardiseases
