THE DEVELOPMENT OF THE UROGENITAL SYSTEM. 395 



Umb. c. 



Gen. r. 



- Gen. tub. 



Gl. p. 



Scr. 



Ug.s. 



343, 

 Fi 



FIG. 347. FIG. 348. 



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



indifferent " stage embryo of 17 mm.; Fig. 344, " indifferent " stage embryo of 23 mm ; 

 g. 345, " indifferent " stage embryo of 29 mm. (beginning of 3d month) ; Fig. 346, female 

 embryo of 70 mm. (n weeks); Fig. 347, female embryo of 150 mm. (16 weeks); Fig. 348, 

 male embryo of 145 mm. (16 weeks). 



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

 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., labiura 

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

 umbilical cord. 



