A textbook of obstetrics . he upper part of the body of the womb and the Fallopiantubes. In the female the Wolffian ducts almost entirely disap-pear, but traces of them may be found as the canals of Gartner. 4^ PREGNANCY Pathological development and distention of these ducts some-times give rise to vaginal cysts, which may obstruct labor. Meanwhile most of the Wolffian body (mesonephros) disap-pears on each side, but remnants of it may be found in the female they constitute the parovarium (epoophoron, orbody of Rosenmuller). The Development of the External Genitals.—The forma-tion of
A textbook of obstetrics . he upper part of the body of the womb and the Fallopiantubes. In the female the Wolffian ducts almost entirely disap-pear, but traces of them may be found as the canals of Gartner. 4^ PREGNANCY Pathological development and distention of these ducts some-times give rise to vaginal cysts, which may obstruct labor. Meanwhile most of the Wolffian body (mesonephros) disap-pears on each side, but remnants of it may be found in the female they constitute the parovarium (epoophoron, orbody of Rosenmuller). The Development of the External Genitals.—The forma-tion of the cloaca is common to both sexes, as is also its separa-tion into an anal and a urogenital portion. The urogenital sinusis at first narrow and deep, but soon becomes shallow, andmeanwhile the perineal tissues separate it more and more fromthe anus. Before the subdivision of the cloaca a genital emi-nence appears at its ventral or anterior end about the sixthweek. On each side of the cloacal slit outgrowths of skin and. •ikr- 34-—To illustrate the development of the human external genitals: I. //,Genital eminence; r, cloacal aperture; s, tail or coccyx of embryo. 2. k, Genitaleminence; r, cloacal opening; 70, commencement of labia majora or scrotum, accordingtosex ; \, embryonic tail. 3. Next stage, practically permanent in the female ; c,Genital eminence (clitoris); /, nymphae; L, labia majora; a, anus. 4. Later ormale condition: /, Penis; A\ edges of embryonic folds enfolding to inclose thepenial urethra; S, scrotum; a, anus. 5 and 6 illustrate the descent of the testicle1 from 1 .andois and Stirling). subcutaneous tissue- < Fig. 34, 1) become prominent. At the eighth or ninth week there is a groove in the tinder (posterior) side ofthe genital eminence, with well-marked side-walls leading back-to open into the cloaca. The development of the perineumdivides this groove (during the third month) transversely into asmaller anal opening and a larger urogenital. This con
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
