File:An American text-book of obstetrics. For practitioners and students (1897) (14765755594).jpg

Identifier: americantextbook00norr (find matches)
Title: An American text-book of obstetrics. For practitioners and students
Year: 1897 (1890s)
Authors: Norris, Richard C. (Richard Cooper), 1863-1937 Dickinson, Robert Latou, 1861-
Subjects: Obstetrics Obstetrics
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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varieties, and from differences in the application of terms designating them.Thus, one author calls that partial which another names lateral, illus-trating the ambiguity which comes from what Lord Bacon spoke of as theunsteady use of words. The writer thinks it better, as Schroeder, Budin, DYSTOCIA. 585 and some others have done, to make but two varieties, complete and lateral.By complete placenta praevia is meant that condition in which the internal osis entirely covered by placenta. It corresponds with what many others havecalled central implantation of the placenta; that is, the centre of the pla-centa is supposed to be directly over the internal os. Pinard32 stated that in15,000 accouchements he never met with the insertion centre for centre, con-sequently he has the right to say that this variety is exceedingly rare. Lateralimplantation of the placenta includes those cases in which the great mass ofthe placenta is at the side of the uterus, a margin more or less near the internal
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Os intern- Vestca, uruiar Fornix vag, ant Os extern,. Vrelkra- Corp,-caAmrru ctUor Praenut. clitor Clitoris. lab mirv dext Lab ™&j dexi Oriflc. urethras. Anus. Fig. 385.—Placenta prsevia : child removed, placenta remaining (Winter). os; indeed, in some cases the margin may partially extend over the os. Thelateral variety is much the more frequent. Figure 385 shows a not infrequent condition, a single cotyledon over the os,while the great mass of the placenta is at the side: the first is known as pla-centa succenturiata. Authorities generally agree that lateral is much more frequent than completeor central placenta. Nevertheless, Trask33 gives 169 of the complete to 88 ofthe lateral, and Midlers statistics, which include those of Trask, show a slightpredominance in favor of the complete variety. Reads statistics34 show a 586 AMERICAN TEXT-BOOK OF OBSTETRICS. similar result. Unfortunately, in many of the cases given by Read there isa failure to state the placental presentation,

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