The vasa deferentia (singular vas deferens) are a pair of tubes in the male reproductive system that carry sperm from the epididymus in the testicles to the ejaculatory ducts where they are mixed with semen and stored.

sterilization procedure, the vasectomy, severs the vasa deferentia, preventing sperm from reaching the ejaculatory ducts without affecting either semen or potency.

Vas deferens at Wikipedia

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