General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . sels. Theselarvae (microfilaria) may remain in man for years, being unableto become mature worms until they enter a suitable intermediate 206 GENERAL PATHOLOGY host—the Culex genus of mosquito, which may occur when a pa-tient is bitten during a time when the larva? are in the peripheralblood. In the mosquito the larvae undergo several developmentalchanges and finally pass into the proboscis whence they may beinoculated into man. Pathologically the filaria may occa
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . sels. Theselarvae (microfilaria) may remain in man for years, being unableto become mature worms until they enter a suitable intermediate 206 GENERAL PATHOLOGY host—the Culex genus of mosquito, which may occur when a pa-tient is bitten during a time when the larva? are in the peripheralblood. In the mosquito the larvae undergo several developmentalchanges and finally pass into the proboscis whence they may beinoculated into man. Pathologically the filaria may occasion no symptoms, thougheosinophilia is always present, but in other cases the parentworms, which lie curled up in the larger lymphatic vessels, trunksor even the thoracic duct cause obstruction of the vessels, lead-ing to distention of tributary vessels; secondary inflammatorythickening may occur, with distention and rupture of the lym-phatics of the kidneys, bladder or other structures, causinghematochyluria, or of the scrotum, causing chylocele, etc. Whenvery extensive the obstruction may extend to the peripheral lym- ?M. -t ^ ? m - Fig. 79.—Filaria embryo, alive in the blood. (F. P. Henry.) phatics with great distention of the tissues, known as Elephan-tiasis, which usually affects the lower limbs, scrotum, and lessoften other parts. (Fig. 79.) The Eustrongylus gigas is a brownish or red worm (the femalemay be 100 cm. long) which is found in the pelvis of the kidney,ureters and bladder of cattle and rarely of man, 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 impregnationburro
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpathology, bookyear19
