The practice of pediatrics . Taenia ^giuala : a, natural size; b, much enlarged; c, ova much enlarged. (Simon.) Taenia solium is shorter than the taenia saginata, measuring from2 to 3 metres, as a rule, rarely reaching a length of 6 to 8 metres. Thehead is very small, is provided with four suckers, and with a rostellnmarmed with a double row of hooklets, twenty-four to twenty-six mature segments measure from 1 to cm. in length, 0 to 7 breadth, and contain a uterus with only five to seven branches. Theova are round, of a brownish color, are surrounded with a thick, radial
The practice of pediatrics . Taenia ^giuala : a, natural size; b, much enlarged; c, ova much enlarged. (Simon.) Taenia solium is shorter than the taenia saginata, measuring from2 to 3 metres, as a rule, rarely reaching a length of 6 to 8 metres. Thehead is very small, is provided with four suckers, and with a rostellnmarmed with a double row of hooklets, twenty-four to twenty-six mature segments measure from 1 to cm. in length, 0 to 7 breadth, and contain a uterus with only five to seven branches. Theova are round, of a brownish color, are surrounded with a thick, radially INTESTINAL PARASITES 313 streaked membrane, and in their interior the hooklets of the embryocan usually be made out. Their diameter is 30 to 35 microns. Theycan hardly be distinguished from the ova of the saginata. The lifecvcle of the taenia solium is the same as that of taenia saginata exceptthat the hog is the intermediary host. Fig. 58. ff Ik s Middle piece of a proglottis of bothnocephalus latus, seen from the dorsal surface, the externallayer almost completely removed: a, lateral vessels ; 6, seminal vesicles; c, seminal duels; d, vasdeferens: g, generative glands; ft, yolk chambers lying in the cortical layers; i, collecting tubules ofyolk chambers; I, commencement of uterus; M, coils of the uterus filled with eggs ; n, vagina; o,vaginal opening. In rare instances the segments of the taenia solium have been taken intothe human stomach, either by being swallowed or by being carried backfrom the intestine by reverse peristalsis. In such cases the ova are setfree in the stomach, the embryos develop there and thence pass intothe blood stream, and so come to lodge in thetissues, muscles, brain, skin, etc. Thus manbecomes the intermediary host. The encystedembryo or cysticercus, as it is called, then formsan elliptical or roundish, transparent vesicle, from1 to 10 mm. in diameter. In its interior thecharacteristic hookl
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectchildren, bookyear190
