General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . causing dilata-tion of these structures with atrophy of their substance. Leptus Autumnalis is a name applied to the larvae of the harvestmite and other mites; they possess a suctorial proboscis withwhich they penetrate the skin and cause greater or less irrita-tion. Acarus scabiei, or Itch-mite, is a pale, spheroidal body withbristly legs. The male ( to mm.) lives upon the surfaceof the skin, but the female ( to mm.) after impregnationburrows into th
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . causing dilata-tion of these structures with atrophy of their substance. Leptus Autumnalis is a name applied to the larvae of the harvestmite and other mites; they possess a suctorial proboscis withwhich they penetrate the skin and cause greater or less irrita-tion. Acarus scabiei, or Itch-mite, is a pale, spheroidal body withbristly legs. The male ( to mm.) lives upon the surfaceof the skin, but the female ( to mm.) after impregnationburrows into the epiderm (thus becoming an endoparasite tern- PATHOLOGY OF INFECTIOUS DIM \ 207 porarily) laying her eggs al intervals in the epidermal tunnel,which appears as a dark line about one centimeter long, amioftenest located between the fingers, on the wrists, elbows, axilla?,etc. Vesicles and sometimes pustules form along the course ofthe burrow. The ova hatch in a few days, forming six-leggedlarva;. (Fig. 80.) The pathologic manifestations produced by the Insecta may besummarized in the statement that some of them cause more or. Fig. 80.—Female acarus (after Anderson). less annoyance by injecting an irritating salivary secretion whenthey bite, which occasionally causes eczema, but more oftenleads to secondary bacterial infection due to the scratching in-duced by the itching. The female jigger (Pulex penetrans) after impregnation bur-rows beneath the skin, as does the Acarus scabiei, especially be-tween the toes, where she lays her eggs, causing inflammationand often ulceration. CHAPTER IX1 MALFORMATIONS The term malformation is used to designate an abnormal de-viation from the usual structure of parts or organs and is theresult of errors or accidents in the process of development. The study of malformations, therefore, is primarily the studyof embryology, because they occur during the process of intra-uterine development. While we have as yet no classification that is entirely s
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