A 28-year-old man presents to a fertility clinic after unsuccessfully attempting conception with his partner for over a year. His past medical history is notable for a minor congenital urinary malformation that required surgical correction in infancy. On scrotal ultrasound and further imaging, abnormalities are noted in the epididymis and vas deferens. Knowledge of embryologic development is essential in understanding his condition. Which embryologic structure is responsible for the development of these male reproductive components?