THE DEVELOPMENT OF THE UROGENITAL SYSTEM. 429 



Umb. i;. 



Gen. i. 



Gen. f. 



FlO. 383. 



Fig. 384. 



Ug. S. — /r-T— ; 



Ra 



■Gl. p. 



Scr. 



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



male embryo of 145 mm. (16 weeks). 

 An., Anus; CI., clitoris; Clo. and, gen. /., cloaca and genital folds; CI. m., cloacal membrane; Ext., 



lower extremity; Gen. /., genital folds; Gen. r., genital ridge; Gen. sw., 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. 



