THE ORGANS OF GENERATION. 



139 



organ of Rosenmiiller consists of a number of the tubules of the upper part of the 

 Wolffian body, and, consequently, is homologous with the epididymis of the male, 

 while the parob'pboron is formed by a few persistent tubules of the lower part of 

 the body, corresponding, therefore, to the organ of Giraldes and the vas aberrans 

 of the male. The lower portions of the Wolffian ducts also persist in the form of a 



10 



FIG. 108. Development of the external genital organs. Indifferent type, i. n. in. Female. A and B. At the 

 middle of the fifth month, c. At the beginning of the sixth. Male. A'. At the beginning of the fourth month. 

 B . At the middle of the fourth month, r.'. At the end of the fourth month. 1. Cloaca. 2. Genital tubercle 3 

 Glans penis or clitoridis. 4. Genital furrow. 5. External genital folds (labia majora or scrotum). 6. Umbilical 

 cord. /. Anus. 8. Caudal extremity and coccygeal tubercle. 9. Labia minora. 10. Urogenital sinus. 11. Fraenum 

 clitoridis. 12. Preputium penis or clitoridis. 13. Opening of the urethra. 14. Opening of the vagina. 15. Hvmen. 

 16. Scrotal raphe. 



pair of tube-like structures, found one on each side in the walls of the uterus and 

 termed the ducts of Gartner. About the fifth month an annular constriction 

 marks the position of the neck of the uterus, and after the sixth month the walls 

 of the uterus begin to thicken. The round ligament is derived from the 

 inguinal ligament of the Wolffian body, the peritoneum constitutes the broad 

 ligament; the superior ligament of the Wolffian body disappears with that 

 structure (Fig. 107). 



The external organs of generation, like the internal, pass through a stage in 

 which there is no distinction of sex (Fig. 108, II, in). We must therefore 



