In male development, secretions from sustentacular (Sertoli) cells trigger the degradation of which embryonic duct system?

1. Two rudimentary duct systems exist in every embryo: the Müllerian duct and the Wolffian duct. 2. For proper male development, one of these ducts must degrade while the other grows. 3. Sustentacular cell secretions cause the Müllerian duct (the female duct precursor) to degrade in males. 4. The Wolffian duct is ruled out because testosterone secretion stimulates ITS growth into the male tract; it survives rather than degrading. 5. The inguinal canal and urogenital sinus are unrelated openings and cavities, not one of the two rudimentary duct systems described here. 6. So the Müllerian duct is the structure that degrades in male development. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 27 "The Reproductive System", p.1309 §Development of the Sexual Organs in the Embryo and Fetus_