Gen. r. 



THE DEVELOPMENT OF THE UROGENITAL SYSTEM. 429 



Umb. c. 



fP3- Umb. c. 



- Gen. tub. 



Gen. f. 



Ug. s. - 



FIG. 385. FIG. 386. 



FIGS. 381-386. Stages in the development of the external genital organs. Kollmann's Atlas. 

 FIG. 381, " indifferent " stage embryo of 17 mm.; Fig. 382, " indifferent " stage embryo of 23 mm.; 



Fig. 383, "indifferent" stage embryo of 29 mm. (beginning of 3d month); Fig. 384, female 



embryo of 70 mm. (u weeks); Fig. 385, female embryo of 150 mm. (16 weeks); Fig. 386, 



male embryo of 145 mm. (16 weeks). 

 An., Anus; CL, clitoris; Clo. and gen. /., cloaca and genital folds; Cl. in., cloacal membrane; Ext., 



lower extremity; Gen. /., genital folds; Gen. r., genital ridge; Gen. su'., genital swelling; 



Gen. tub., genital tubercle; Gl. p., glans penis; Lab. ma., labium majus; Lab. mi., labium 



minus; Ra., raphe of scrotum; \Scr., scrotum; Ta., tail; Ug. s., urogenital sinus; Umb. c. y 



umbilical cord. 



