. A practical treatise on diseases of the skin, for the use of students and practitioners. tly coexists with other cutaneous, parasitic, and non-parasitic diseases, as, for example, seborrhea, eczema, and tinea ton- surans. Favus of the Nail (Favic Onychomycosis). Rarely, one orseveral of the nails may be the seat of the fungus, and either theentire body of the nail or but a part of it. The lesions are maize-yellow points or macules where the substance of the organs is eroded,fissured, or split into striations—changes quite like those induced byother causes. The connections of the nail with th
. A practical treatise on diseases of the skin, for the use of students and practitioners. tly coexists with other cutaneous, parasitic, and non-parasitic diseases, as, for example, seborrhea, eczema, and tinea ton- surans. Favus of the Nail (Favic Onychomycosis). Rarely, one orseveral of the nails may be the seat of the fungus, and either theentire body of the nail or but a part of it. The lesions are maize-yellow points or macules where the substance of the organs is eroded,fissured, or split into striations—changes quite like those induced byother causes. The connections of the nail with the underlying nail-bedand nail-folds are loosened, wholly or in part, while the matrix stillholds the nail firmly in position. Under the microscope minute collections of spores surrounded bybranching mycelium of the achorion are recognized in isolated pointsor in diffuse patches in epidermic scales scraped from the fungus never penetrates within the papillary layer, but ramifiesto a varying extent in different cases in both the upper and lowerportions of the rete. Fig. w Achorion Schonleinii: a, spores; b, c, sporophores (after Cornil and Ranvier). Etiology. Favus is always produced by the presence and develop-ment of the vegetable organism which is named after its discoverer,the achorion Schonleinii (Fig. 92). It is a contagious disease simplybecause the parasite which produces it is capable of transmission fromman to man, as also from animals to man, and vice versa. It is oftenconveyed to man from mice, cats, dogs, rabbits, fowls, and ponies;but when derived from the lower animals, is most often transmittedfrom mice to cats and from cats to man. It shares with other diseasesoriginating from vegetable parasites, the peculiarity of attacking certainindividuals specially predisposed to such invasion, either by reason ofphysical peculiarities of organization or accidental and fortuitous cir-cumstances. It is most common from infancy to the thirtieth year oflife.
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Keywords: ., bookauthorhydejamesnevins184019, bookcentury1800, bookdecade1890
