The vas deferens is a muscular tube whose main job is to carry mature sperm from the epididymis to the urethra during ejaculation so they can leave the body in semen.

Quick Scoop

  • It connects the epididymis (where sperm are stored and matured) to the ejaculatory ducts and then the urethra.
  • During sexual arousal, smooth muscles in its walls contract and push sperm forward in powerful waves (peristaltic contractions).
  • Along the way, sperm mix with fluids from the seminal vesicles and prostate to form semen.
  • There are two vas deferens tubes, one from each testicle.
  • In a vasectomy, doctors cut or block the vas deferens so sperm can’t reach the semen, preventing pregnancy while leaving hormone levels and erections unchanged.

In one simple line

The vas deferens is the “transport tube” that moves and helps deliver sperm from the testicles to the urethra so they can be ejaculated in semen.

Information gathered from public forums or data available on the internet and portrayed here.