A textbook of obstetrics . d 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 PREGNANCY origin to the Miillerian duct and some segmental tubes and sooncease to 1). distinct ; on the former they constitute the primi-tive germinal epithelium. The mesoblast lying beneath thisepithelium gives rise to the blood-vessels and connective t
A textbook of obstetrics . d 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 PREGNANCY origin to the Miillerian duct and some segmental tubes and sooncease to 1). 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) ^i 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 Fig. ji, — 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; //, Wolffian duct ; J/, duct of Midler;S, urogenital sinus. 2, Modifications in the female : /. Primitive Miillerian duct,forming the Fallopian tube and developing fimbriae, its peritoneal opening;h\ ovarian hydatid ; I \ uterus formed by fusion of the posterior ends ^\ the ducts ofMidler; .V, urogenital sinus; O (answering to D in 1), ovary; /. parovarium, or it of Wolffian body and duct. Modifications in the male : //, Testi I onding to J) in h ; E, epididymis; //, hydatid of Morgagni ; a, vas aberrans;/. vas deferens, or Wolffian duct ; u, uterus masculinus, the remnant ot the lowerends of the fused du< ts of Midler; S, urogenital sinus (from Landois and Stirling). The testicle is distinguishable from the fetal ovary about theeighth week
Size: 2255px × 1108px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
