External genitalia

In the indifferent stage the external genitalia are made up of a small genital tubercle, urethral folds, and genital (labioscrotal) swellings. Later, these swellings form scrotal swelling in the male and the labia majora in the female.
In the female, the genital tubercle forms the clitoris, urethral folds develop into the labia minora, while the genital swelling forms the labia majora.
In the male, the genital tubercle elongates into the glans penis, while the urethral folds fuse to form the corpus of the penis. The genital swellings subsequently unite into a single scrotum.


Development of the external genitalia

Development of the external genitalia

 


1. Anal membrane
2. Genital (labioscriotal) swelling
3. Genital tubercle
4. Urethral folds
5. Anal fold
6. Urogenital membrane

 

 

 

 

1. Scrotal swelling
2. Urethral folds
3. Perineum
4. Anal fold
5. Phallus
6. Urethral groove
7. Labia majora
8. Clitoris
9. Labia minora