 Fetal Müllerian ducts are only sensitive to AMH action around the 7th or 8th week of gestation, and Müllerian regression is completed by the end of the 9th week.The AMH induced regression of the Müllerian duct occurs in cranio-caudal direction via apoptosis.The AMH receptors are on the Müllerian duct mesenchyme and transfer the apoptotic signal to the Müllerian epithelial cell, presumably via paracrine actors.