Identifier: scienidw00lusk (find matches)
Title: The science and art of midwifery
Year: 1897 (1890s)
Authors: Lusk, William Thompson, 1838-1897
Subjects: Obstetrics Women Pathology
Publisher: New York, D. Appleton
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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Twin placenta, showing arterial aua>* branches to the umbilical arteries of the less favored twin ; this forceis, however, insufficient to carry the current to the upper parts of thebody, which are, therefore, not developed. The favorable position ofthe lower extremities for receiving the blood from the umbilical vesselsexplains their continued tlmugh imperfect growth and developmentThe blood carried to the foetus by the umbilical arteries is returned bythe umbilical vein. According to Ahlfeld,* a division may take place in the formativematerial contained within a single area germinativa. This division * Ahltbld, Die Entstehnngder Doppelbildung and dor homologen Zwillinge, Anh. f. Gynaek., Bd. ix. \>. 196. 230 LABOR. may be complete, and thus produce separate twins inclosed in thesame amnion, which not only are of the same sex, but bear to oneanother through life the most striking similarity as regards appear-ance, physical peculiarities, and both mental and moral characteris-
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tic (26 Authors cage <f acardia. The monstrosity weighed three pounds nine ounces; there were no t r;u es ol heart, lungs, pancreas, liver, spleen, or Sternum. tics; or il maybe incomplete, and thus give rise to conjoined twins,or one of the numerous forms of double monsters.* In triplets, it is common to find one child derived from an inde-pendent ovum and two from a single ovum. In a case of quadruplets * Schultze, on the other hand, contends that the double monsters are derivedfrom the fu-i<<n of two embryos developed upon the blastodermic vesicle at pointsclose to one another. Schultze, Ueber Zwillingsschwangerschaft, VblkraannsSaium. klin. Vortr.. No. 84. MULTIPLE PREGNANCIES AND THEIR MANAGEMENT. 231 reported by I. Midler,- two ova were simple, while the third containedtwo embryos. The children in the single ova were of the female,while those in the double ovum were of the male sex. The average weight of the individual children in multiple preg-nancies is less than that

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