122 HUMAN EMBRYOLOGY AND MORPHOLOGY. 



the pudendal cleft of the female. In its anterior angle is developed 

 a prominent tubercle — the genital tubercle, the apex of which 

 becomes the glans penis or glans clitoris, according to sex. It is 

 bounded by lateral folds, the genital folds (Fig. 98). The 

 genital folds divide in front ; the inner division of each runs to 

 the glans and forms the fraenum ; the lateral divisions meet over 

 the glans and form the prepuce. 



External Genitals of the Female. — In the female the parts 

 retain closely the early fdetal form just described. The genital 

 tubercle becomes the glans clitoris. In the genital eminence — of 

 which the tubercle is merely the summit, the corpora cavernosa 

 develop. The lateral genital folds form the labia minora, the prepuce 

 and fraenum. By the junction of the genital folds within the uro- 

 genital depression behind, the fourchette is formed. Within the 

 lateral folds or labia minora, are developed the bulbs of the 

 vestibule. The uro-genital depression becomes the pudendal cleft. 

 After the third month external genital folds arise and form the 

 labia majora. By their anterior union they give rise to the mons 

 Veneris. Their posterior extremities unite to form the posterior 

 commissure. 



genital tubercle 

 outerfold 

 genital fold (inner) 

 ■urogenit. dep. 



raphe 

 anal depression 



Fio. 98.— The Uro-genital Cleft or Depression and the Genital Tubercle and Folds 

 towards the end of the 2nd month. 



External Genitals of the Male. — In the male, at the end of 

 the third month, the lateral genital folds begin to unite from 

 behind forwards, thus closing the uro-genital cleft and forming the 

 floor of the penile urethra. While the floor of the penile urethra 

 is formed thus, its roof, corresponding to the vestibule of the 

 female, is derived from an angular forward prolongation of the 

 uro-genital sinus. (See Fig. 95 B.) When the genital folds unite 



