DEVELOPMENT OF MALE EXTERNAL
GENITALIA
(stimulated by testosterone)
Begins at 9th week
Complete differentiation at 12th week:
1. The phallus enlarges to form the penis
2. The urogenital folds fuse to form the spongy (penile) urethra
3. The labioscrotal folds (swellings) fuse to form the scrotum
B-Different stage:
BEGINS AT 9TH WK
Male External Genitalia
*Differentiation of male external genitalia is induced by testosterone secreted by
testes.
*Completed by 12th week
• genital tubercle (phallus) will elongate & differentiates to form corpora of penis.
• genital folds elongate & fuse to form skin of undersurface of penis. , Prepuce
grows forwards as a fold of skin which covers glans penis.
• labioscrotal swellings
fuse together to form scrotum. The line of fusion is indicated internally by scrotal
septum & externally by scrotai raphe.
GENITALIA
(stimulated by testosterone)
Begins at 9th week
Complete differentiation at 12th week:
1. The phallus enlarges to form the penis
2. The urogenital folds fuse to form the spongy (penile) urethra
3. The labioscrotal folds (swellings) fuse to form the scrotum
B-Different stage:
BEGINS AT 9TH WK
Male External Genitalia
*Differentiation of male external genitalia is induced by testosterone secreted by
testes.
*Completed by 12th week
• genital tubercle (phallus) will elongate & differentiates to form corpora of penis.
• genital folds elongate & fuse to form skin of undersurface of penis. , Prepuce
grows forwards as a fold of skin which covers glans penis.
• labioscrotal swellings
fuse together to form scrotum. The line of fusion is indicated internally by scrotal
septum & externally by scrotai raphe.