File:The American text-book of obstetrics for practitioners and students (1903) (14775180234).jpg

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Identifier: americantextbook02came (find matches)
Title: The American text-book of obstetrics for practitioners and students
Year: 1903 (1900s)
Authors: Cameron, James C. (James Chalmers) Norris, Richard C. (Richard Cooper), 1863-1937 Dickinson, Robert Latou, 1861-1950
Subjects: Obstetrics
Publisher: Philadelphia : W.B. Saunders & Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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be con-sidered as site of attachment normal :in<l safe. This security is -till greaterwhen the placenta is attached in part in the superior zone and in part in theequatorial zone. The danger begins when the placenta is attached in part inthe inferior zon<—thai is, when there is partial placenta praevia. The portion of the placenta which encroaches upon the inferior zone (l.z.) i- liable to premature separation. Complete placenta prsevia, called also placenta prceviacentralis, is found when the entire placenta or the greater part of it is attachedin the inferior zone and covers the internal 08. In the last case the gestation would be, justly speaking, an ectopic gestation(or out of place), for the ovum, or an important part of it, is developed in theinferior zone of the uterus, a part which is not designed by nature for thisfunction. The curved line traced in the inferior zone marks the position ofthe fetal head. The line of demarcation (3, 4) corresponds almost exactly fUNDAL
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Pig. 98.—Varieties f placenta praevia : In A there are seen the normal, lateral, and marginal Implan-tation; in l! there are represented the Implantation of the placenta at the fundus, which is rare, amiImplantation over the Internal oa; in C lateral implantation and that of a cotyledon immediately over the internal os; and in 1) partial implantation. with the equator of the fetal head, and often it nearly corresponds with theentrance of the pelvis. 112 AMERICAN TEXT-BOOK OF OBSTETRICS. Varieties of Placenta Prcevia.—The accompanying illustration (Fig. 93)shows different forms of placental implantation in the lower portion of theuterus, and the names applied to them, and also implantation at the fundusand at the fundus and side. Some confusion has arisen from giving so manyvarieties, 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

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