. The elements of pathological histology with special reference to practical methods . he normal papillae of the skin and mucous membranes, andin their formation there occurs not only an enlargement of the latterbut also a new formation of papilke. Cutaneous umris are papillomata with an abnormal degree of hornytransformation of the epidermis, causing the latter to rise in a conicalform above the enlarged or newly-developed papillae (Fig. 54). Theacuminate condyloma likewise belongs to the papillomata. Those papillomata of mucous membranes which are constructedmore after the type of the intest
. The elements of pathological histology with special reference to practical methods . he normal papillae of the skin and mucous membranes, andin their formation there occurs not only an enlargement of the latterbut also a new formation of papilke. Cutaneous umris are papillomata with an abnormal degree of hornytransformation of the epidermis, causing the latter to rise in a conicalform above the enlarged or newly-developed papillae (Fig. 54). Theacuminate condyloma likewise belongs to the papillomata. Those papillomata of mucous membranes which are constructedmore after the type of the intestinal or synovial villi, as for examplethe papillomata wdiich occur on the mucous membrane of the urinarybladder, are also called villous tumours (Fig. 153). 6. (v.) Polypi.—These occur only upon mucous membranes, of whichthey form outgrowths or circumscribed elevations, containing as a ruleelements similar to those in the particular mucous membrane itself,and hence always covered with an epithelial coat which usually corre-sponds to that of the parent tissue (Figs. 55 and 56, a).. Fig. 55.—Mucous Polypus of the Nose, x 285. (Hsematoxylin and eosin.) a, Cylindricalepithelium consisting of several layers of cells ; b, Round cells; c, Spindle-shaped cells ; cells, with and without pigment; e, Injected blood-vessels. The rest of the tissue of polypi shows a somewhat variablecomposition. It consists either of fibrous connective tissue with but 110 TUMOURS OR NEW-FORMATIONS few cells {fibrous polypus), or of an oedematous connective tissue ormucous tissue {mucous polypus, Fig, 55), or lastly of a round-celledtissue {sarcomatous polypus). In many polypi there also occur more orless abundant glands (Fig. 56, h), which correspond in size and generalcharacter with those of the particular mucous membrane, l)ut oftenexhibit cystic dilatations {cystic jyolypi). M^^(^^ a
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
