838 



EMBRYOLOGY 



into the hilum. At the time that the kidneys are undergoing develop- 

 ment, the suprarenal capsules are formed at their superior extremities. 

 These bodies are relatively so much larger in the foetus than in the 



Fig. 242. Diagrammatic representation of the genito-urinary system (Henle). 



I, embryonic condition, in which there is no distinction of sex; II, female form ; 1 1 1, male form. The 

 dotted lines in II and III represent the situations which the male and female genital organs assume 

 after the descent of the ovaries and testicles. The small letters in II and III correspond to the 

 capital letters in I. 



FIG. 242, I. A, kidney; B, ureter; C, bladder; D, urachus, developed into the median ligament of 

 the bladder; E, constriction which becomes the urethra; F', Wolffian body; G, Wolffian duct, 

 with its opening below, G' ; //, duct of Miiller, united below, from the two sides, into a single tube, 

 /, which presents a single opening,/', between the openings of the Wolffian ducts; K, ovary or 

 testicle ; L, gubernaculum testis or round ligament of the uterus ; M, genito-urinary sinus ; N, O, 

 external genitalia. 



FIG. 242, II (female). a, kidney; b, ureter; c, bladder; d, urachus; e, urethra; / remains of the 

 Wolffian body (parovarium) ; g, remnant of the Wolffian duct ; h, Fallopian tube ; i, uterus ; 

 2', vagina; k, ovary ; /, round ligament of the uterus; m, extremity of the urethra; n, clitoris; 

 ri ', corpus cavernosum of the clitoris; ",bulb of the vestibule; o, external genital opening; p, ex- 

 cretory duct of the gland of Bartholinus. 



FIG. 242, III (male). a, kidney; , ureter; <:, bladder; d, urachus; e, m, urethra; / epididymis ; 

 g , vas deferens; g' ', seminal vesicle; g" , ejaculatory duct; k, i, remains of the duct of Mtiller; 

 k, testicle; /, gubernaculum testis; a, n' ', n", urethra and penis; o, scrotum; /, gland of Cowper ; 

 q, prostate. 



