USMLE Step 2 CK Lecture Notes 2019: Obstetrics/Gynecology (Kaplan Test Prep)

MALE EXTERNAL GENITALIA

Dihydrotestosterone (DHT) stimulation is needed for differentiation of the
external genitalia into a penis and scrotum. If a genetic male has an absence of
androgen receptors, external genitalia will differentiate in a female direction.

Figure I-1-3. Testicular    Function

Table I-1-4. Hormones

Hormones    Needed  for Genital Development

External? None

Internal?

External? Androgen

Internal?

Primordia Female Male Major Determinant Factors