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The bi-potential external genitalia are those that exist before the the genitalia differentiate into male or female genitalia under the influence of various hormones. The structures that are eventually derived from the 3 main parts of the undifferentiated external genitalia are as follows for females and males:

Female

  • Genital (or phallic) tubercle = clitoris
  • Urethral folds = labia minora
  • Labioscrotal swelling = labia majora, mons pubis

Male

  • Genital (or phallic) tubercle = penis
  • Urethral folds = ventral aspect of the penis
  • Labioscrotal swelling = scrotum
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