A system of surgery . , apparently within a lymphatic have not up to the present allowed an exact descrip-tion of the male worm, which long remained undiscovered. Thefemale is about three and a half inches in length, -^-^ of an inchin breadth, uniform in calibre. The head is provided with acircular mouth and is destitute of papillae. A narrow alimentarycanal runs from the simple club-like head to within a short distanceof the blunt-pointed tail, the remainder of the body being entirelyoccupied by the reproductive organs packed with numerous em-bryonic filarise. The reprod
A system of surgery . , apparently within a lymphatic have not up to the present allowed an exact descrip-tion of the male worm, which long remained undiscovered. Thefemale is about three and a half inches in length, -^-^ of an inchin breadth, uniform in calibre. The head is provided with acircular mouth and is destitute of papillae. A narrow alimentarycanal runs from the simple club-like head to within a short distanceof the blunt-pointed tail, the remainder of the body being entirelyoccupied by the reproductive organs packed with numerous em-bryonic filarise. The reproductive outlet is close to the head.(Cobbold; Manson). The embryo when born is enclosed in a, shell or sheath, withinwhich it may be either coiled up or extended, and which it retainspermanently while within the human body. This variation in format birth is of extreme importance, the coiled embryo of oval shape mea-suring -g^ x y^- of an inch, while when uncoiled its measurementsl* 2 SURGICAL DISEASES DUE TO Fi 59.—Embryonic Filarial in red discs are somewhatshrunken, also the sheath of theembryo. are yt x tsVo °^ an incn- When uncoiled, it is rounded at theanterior extremity and tapers posteriorly, the retained sheath pro-jecting as an empty space behind the minute worm, which doesnot completely fill it longitudinally. According to Manson, thecoiled embryo, which he regards as an abortion, is responsible fromits large size, for the lymphatic obstruction. Lodging in the efferentvessels of the glands, it interferes more or less with the passage of lymph, causing dilatation and vari-cosity of the vessels, or complete ob-struction. The uncoiled embryo, onthe other hand, which nearly corre-sponds in width with the red blooddiscs, readily traverses the blood-vessels, and it is this which is foundin the general circulation (Fig. 59).The presence of the embryonicfilarise in the cutaneous blood-vessels undergoes diurnal varia-tions. While the patient is movingan
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