Definition of Vas Deferens and Function

A narrow tube that carries sperm from the epididymis to the ejaculatory duct during orgasm and ejaculation.

One vas deferens, also called a ductus deferens, arises from each testicle. The smooth-muscle walls of the vas deferens contract and relax in wavelike movements to propel sperm from the testicle to mix with seminal fluid, which then carries the fluid (Semen) from the penis during ejaculation.

For further discussion of the structures and functions of reproduction and sexuality, please see the overview section “The Reproductive System.”


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