A text-book of the diseases of the ear for students and practitioners . and raspberry-like. Frequently, in theneighbourhood of the root of large and smooth polypi, a * Kirchner, Ueber Olirpolypen (Inaug. Diss., Munich, 1876). STRUCTURE OF AURAL POLYPI 623 number of papillary excrescences are found (Fig. 284, e). Thegrowths have either a broad base, or a thin, pedunculated root. Structure of Aural Polypi.—When aural polypi are examined histo-logically two principal forms are generally found—round-celled polypi, andfibromata. True mysomata (Steudener), or tumours composed principally ofepithelia
A text-book of the diseases of the ear for students and practitioners . and raspberry-like. Frequently, in theneighbourhood of the root of large and smooth polypi, a * Kirchner, Ueber Olirpolypen (Inaug. Diss., Munich, 1876). STRUCTURE OF AURAL POLYPI 623 number of papillary excrescences are found (Fig. 284, e). Thegrowths have either a broad base, or a thin, pedunculated root. Structure of Aural Polypi.—When aural polypi are examined histo-logically two principal forms are generally found—round-celled polypi, andfibromata. True mysomata (Steudener), or tumours composed principally ofepithelial tissue (Weydner), are rare.* The round-celled polypus consists of a hyaline, homogeneous stromatraversed by a more or less well-developed fibrous framework, in whichscattered or closely-packed round cells, and sometimes also a few spindlecells, are embedded (Fig. 287, d cV). By metamorphosis of the round cellsinto spindle cells, the soft polypus obtains a hard, fibrous character. Thischange usually proceeds irregularly from the root to the body of the Fig. 287. The surface of these polypi is seldom smooth, but mostly of a glandular,papillary nature, having deep indentations (Fig. 287) similar to those foundon glands; still, according to Bruhl. the occurrence of true glands in suchpolypi is rare. The surface of the new growths is covered with an epitheliumwhich shows all the transition stages from simple ciliated epithelium (polypiof the tympanic cavity) and pavement epithelium (polypi of the auditorycanal) to the complicated epithelium of the mucous membrane of the polypi of the tympanic cavity are also covered with squamousepithelium. A combination of different forms of epithelium on one and thesame polypus, that is the ciliated variety in the region of the root andpavement epithelium in the other parts of the growth, is not rare. In theinterior of the polypus enclosed cavities lined with epithelium (c, c, c) areoften found, as well as cyst-like
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectear, booksubjecteardi
