A textbook of obstetrics (1898) (14777449861)

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

Text Appearing Before Image:

e 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. 42 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 adults.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

Text Appearing After Image:

Fig. 34.—To illustrate the development of the human external genitals: I. A,Genital eminence ; r, cloacal aperture; s, tail or coccyx of embryo. 2. //, Genital eminence ; r, cloacal openingingtosex; s, embryonic tail.Genital eminence (clitoris) ;male condition : P, Penis ;penial urethra ; .9, scrotum ;(from Landois and Stirling). v, commencement of labia majora or scrotum, accord- 3. Next stage, practically permanent in the female ; c, /, nymphae ; Z, labia majora; a, anus. 4. Later or P, edges of embryonic folds enfolding to inclose the a, anus. 5 and 6 illustrate the descent of the testicle subcutaneous tissue (Fig. 34, 1) become prominent. At the eighthor ninth week there is a groove in the under (posterior) side ofthe genital eminence, with well-marked side-walls leading backto 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 conditionis but slightly modified in

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1898

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