An American text-book of the diseases of children ..

Description:

a. and b. Ascaris lumbricoides, c. Enterobius vermicularis Identifier: amerbook00star (find matches)
Title: An American text-book of the diseases of children ..
Year: 1895 (1890s)
Authors: Starr, Louis, 1849-1925 Westcott, Thompson Seiser, 1862-
Subjects: Children
Publisher: Philadelphia, W.B. Saunders
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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, it is of an ivory white.The worm is cylindrical in shape, iaperng to a point at both ends. The mouthis situated between three lips furnished with fine teeth at the anterior extremityof the body. The anus is about an inch from the posterior extremity, and thevulva in the female is anterior to the middle. The sexes are easily distinguishedby their relative size and by the fact that the posterior extremity of the maleis curved, that of the female being straight (Fig. 1, a and b). From earth-worms, which I have known to be presented by patients withthe intention of deceiving, they may be distinguished by their color and bythe fact that earth-worms, being annelids, have plainly-marked segments.Female lumbricoids which have been carelessly handled and subjected to pres- 540 INTESTINAL IAHASITES. 541 sure often show the ovaries hanging out like a bunch of small worms, and maydeoeive the superficial observer. The ova of the round-worm are produced by the females in great quantities, Fig. 1.
Text Appearing After Image:
Round-worms and Pin-worms (% Natural Size), a, Male Round-worm c, Female Pin-worm. b. Female Round-worm and pass off in the faeces, where they can easily be found with the microscope.They are oval in shape, about ^-g- of an inch long, with dark granular con-tents and thick transparent coats, which are often stained yellow by bile (Fig.2, c). The proper habitat of the adult ascarides is the small intestine, but theyare of a wandering disposition, and have been found in the stomach, oesopha-gus, and mouth, occasionally getting up into the posterior nares and comingout anteriorly, or going down into the larynx or even into the lungs. Theyalso wander down into the rectum, and are expelled with the faeces or slip outunattended. They have even escaped into the peritoneal cavity through per-forations made, not by them, as wTas once supposed, but by ulcerations. Theyhave been known to pass into the pancreatic and biliary ducts. When in largenumbers the worms are often coiled together into bal

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