. The elements of pathological histology with special reference to practical methods . ajority of cases, if not invariably,caused by bacteria, amongst which the pyococci play a prominentpart. Histologically it is characterised first by immigration ofleucocytes, mostly of the polynuclear variety, which are derivedchiefly from the hyperiemic vascular network of the conjunctivallimbus («), and collect more or less abundantly in the juice-lacunseof the cornea. If the latter are narrow, the leucocytes may alsobecome flattened, so as to assume a spindle shape. If the inflamma- KERA TITIS 405 tion is
. The elements of pathological histology with special reference to practical methods . ajority of cases, if not invariably,caused by bacteria, amongst which the pyococci play a prominentpart. Histologically it is characterised first by immigration ofleucocytes, mostly of the polynuclear variety, which are derivedchiefly from the hyperiemic vascular network of the conjunctivallimbus («), and collect more or less abundantly in the juice-lacunseof the cornea. If the latter are narrow, the leucocytes may alsobecome flattened, so as to assume a spindle shape. If the inflamma- KERA TITIS 405 tion is superficial it gives rise to loosening (h), degeneration, andeven shedding (d) of the epithelium. In the latter case a cornealulcer is formed, which in its further course may attain variabledimensions. If, however, the deep-lying parts of the cornea areaffected, a fibrinous or purulent exudation (Jiypopyon) is very oftenfound in the anterior chamber of the eye (Fig. 209, a). For diphtheritic keratitis, see p. 415. In keratomalacia infantum an infiltration occurs in the part of Fig. 206.^Suppuhatxve Keratitis following flap extraction of a cataract, x 70.(Hgematoxylin and eosin.) a, Limbus cornese with hypersemia of the ciliary vessels,extravasations, and purulent infiltration ; h, Vestiges of epithelium ; c, Purulent infiltra-tion of the peripheral part of the cornea; d, Necrotic part of the cornea; e. Little massof pus on tlie sui-face of the corneal wound; /, Desccmets membrane; g, Endotheliumof the anterior chamber. the cornea corresponding to the palpebral fissure which quicklychanges into an ulcer enlarging in all directions. The juice-canaliculiin the vicinity of the ulcer are found densely packed with bacteria,consisting partly of Staphylococcus pyogenes and partly of other asyet unknown species. In corneal as in conjunctival herpes smallvesicles develop, the coverings of which are formed from the epithe-lium and most superficial layers of the cornea, and which qui
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpatholo, bookyear1895
