File:A textbook of obstetrics (1898) (14800458773).jpg

Identifier: textbobstet00hirs (find matches)
Title: A textbook of obstetrics
Year: 1898 (1890s)
Authors: Hirst, Barton Cooke, 1861-1935
Subjects: Obstetrics
Publisher: Philadelphia : 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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cellsremain for some time over all of the projecting surface of theintermediate cell-mass, and even extend beyond it upon the outerside of the developing mesentery. They soon become flattenedover most of the mass, but remain columnar and multiply forsome time on its inner and outer sides. On the latter they give 40 PREGNAXCY. origin to the Miillerian duct and some segmental tubes and sooncease to be distinct ; on the former they constitute the primi-tive germinal epithelium. The mesoblast lying beneath thisepithelium gives rise to the blood-vessels and connective tissue(stroma) of the ovary or testis, as the case may be. At thisstage it is difficult or impossible to detect the sex of the em-bryo from the structure of the sexual glands. In the female some cells of the germinal epithelium enlarge toform the primitive ova. Surrounded by other cells from the germi-nal epithelium, they grow into the ovarian stroma as the egg-tubesor cords and give rise to the primitive Graafian follicles.
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Fig. 31.—Diagrams to illustrate the development of the internal genital organsin both sexes. I, Hermaphrodite or undifferentiated condition : d, Ovary or testis,lying upon the tubules of the Wolffian body ; IF, Wolffian duct; M, duct of Miiller;S, urogenital sinus. 2, Modifications in the female : T, Primitive Miillerian duct,forming the Fallopian tube and developing fimbriae, P\ around its peritoneal opening;//, ovarian hydatid; U, uterus formed by fusion of the posterior ends of the ducts ofMiiller; S, urogenital sinus; O (answering to D in I), ovary; P, parovarium, orremnant of Wolffian body and duct. 3, Modifications in the male : H, Testis(corresponding to D in I) ; P, epididymis ; //, hydatid of Morgagni ; a, vas aberrans ;V, vas deferens, or Wolffian duct; m, uterus masculinus, the remnant of the lowerends of the fused ducts of Miiller ; S, urogenital sinus (from Landois and Stirling). The testicle is distinguishable from the fetal ovary about theeighth week. The cells which

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