Where do the ductus deferens and seminal vesicles join?

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Front view anatomical diagrams of the male and female reproductive systems, with labeled organs including penis, testis, prostate gland, uterus, ovary, and vagina. — human reproductive system Organs and structures of the male and female reproductive systems.

The ductus deferens (also known as the vas deferens) and the seminal vesicle join near the base of the prostate gland to form the ejaculatory duct.123

Specifically, the enlarged portion of the ductus deferens, known as the ampulla, unites with the excretory duct of the seminal vesicle. This union creates the ejaculatory duct, which then transports sperm and seminal fluids into the urethra.142