Which structures form the ejaculatory ducts?

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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 ejaculatory ducts are two hollow tubes formed by the union of the ampulla of the ductus deferens and the excretory duct of the seminal vesicle.1

These ducts function to mix sperm with fluids secreted by the seminal vesicles and transport the resulting mixture into the urethra through the prostate gland.1