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Stages in the development of the external sexual organs in the male and female
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A is a body of tissue which forms in the ventral, caudal region of
Mammal ian
Embryo s of both
Sex es, and eventually develops into a
Phallus . In the human
Fetus the genital tubercle develops around week 4 of
Gestation , and by week 9 becomes recognizably either a
Clitoris or
Penis .
The genital tubercle is sensitive to
Dihydrotestosterone and rich in
5-alpha-reductase , so that the amount of fetal
Testosterone present after the second month is a major determinant of phallus size at birth.
