Male Internal Organs: Critical Gestation Event

The development of internal sex organs in males during the 3rd month of gestation is a hormonally regulated process initiated by the fetal testes.

AMH Role in Male Internal Organ Development

• Antimullerian hormone (AMH), produced by the Sertoli cells of the developing testes, is crucial.
• AMH induces the regression (degeneration) of the Mullerian ducts.
• Mullerian ducts are precursors to female internal reproductive structures like the uterus and fallopian tubes.
• The elimination of Mullerian ducts ensures that male internal organs, derived from Wolffian ducts (epididymis, vas deferens, seminal vesicles), can develop properly.
• Therefore, the presence of AMH is a critical event for establishing the male internal reproductive system by preventing the development of female structures.

Other Factors in Male Sex Organ Development

• The 'sry gene' activation is essential for initiating testis development itself, which precedes AMH production.
• Dihydrotestosterone (DHT) is vital for the development of external male genitalia and accessory glands, impacting different structures than those in question.
• While testis development is foundational, AMH's specific action on Mullerian duct regression is the key event for differentiating the internal sex organs in males during this gestational period.