netter184
Development of the External Genitalia
ENDOCRINE PHYSIOLOGY
Body of ditoris
Prepuce
Vagina
Perineal raphe
Perianal tissues, including external
induding
extcmal
sphincter
folds
tag of penis
Figurę 8.24 Differentiation of the External Genitalia
During early embryonic development, the extcmal genitalia are undifferentiated and consist of tissue swellings comprised of the gerv ital tubercle and urethral and anal folds. Under the influence of dihy-drotestosterone. the gcnital tubercle elongates to form the phallus i.glans) and normal małe external gcnital development proc.eeds. In the absence of testicular androgens, the undifferentiated genitalia develop into those of a normal female. The color scheme ot this fig ure dearły shows the homologous structures of the extemal genitalia between the Iwo sexes.
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