Identifier: systemri01hirs (find matches)
Title: A system of obstetrics
Year: 1888 (1880s)
Authors: Hirst, Barton Cooke, 1861-1935
Subjects: Obstetrics
Publisher: Philadelphia, Lea brothers & co.
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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sversely into a smaller anal opening and a largerurogenital. This condition (III, Fig. 145) is but slightly modified inthe female. The genital eminence in that sex remains small and con-stitutes the clitoris (c, III, Fig. 145, and ec, Fig. 142). The side-walls(V, II, Fig. 145) remain separate and form the labia minora (I, III,Fig. 145), while the cutaneous folds (w, II, Fig. 145) enlarge andbecome the labia majora (/, Fig. 142, and Z, Fig. 145, III). The uro-genital sinus is therefore permanent in woman, and forms the vestibule,which has in front of it the clitoris, and, opening into it, the urethraand vagina. In the male a further development takes place (Fig. 145, IY). Thegenital eminence enlarges to form the penis, and the groove beneath itcloses so as to form the penial urethra. The corpus spongiosum of 200 DEVELOPMENT OF THE EMBRYO. man is for the most part equivalent morphologically to the nvmphseof the woman, which remain in a separated and more embryonic con- Fig. 145.III. IV.
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(From Landois and Stirling.) To illustrate the Development of the Human External Genitals :I: h, genital eminence ; r, cloacal aperture ; s, tail or coccyx of embryo. II: h, genital emi-nence ; r, cloacal opening; w, commencement of labia majora or scrotum, according to sex;s, embryonic tail. Ill, next stage, practically permanent in the female : c, genital eminence(clitoris); I, nymphse; L, labia majora; a, anus. IV, later or male condition : P, penis; R,edges of embryonic folds infolding to enclose the penial urethra; S, scrotum; a, anus. Vand VI, illustrate the descent of the testicle. dition. The skin-folds, which remain separate in the female as thelabia majora (L, III, Fig. 145), coalesce in the male (IV, S) to formthe scrotum. THE FOETUS: ITS PHYSIOLOGY ANDPATHOLOGY. By BAETON COOKE HIRST, M.D., Philadelphia. THE DEVELOPMENT OF THE FCETUS IN THE DIF-FERENT MONTHS OF PREGNANCY. The changes in the developing embryo and foetusl that mark itsgrowth from month to month are not only

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