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Vas Deferens

The vas deferens, also called ductus deferens, is part of the male anatomy of many vertebrates; they transport sperm from the epididymis in anticipation of ejaculation. During ejaculation the smooth muscle in the walls of the vas deferens contracts reflexively, thus propelling the sperm forward. This is also known as peristalsis. The sperm is transferred from the vas deferens into the urethra, collecting secretions from the male accessory sex glands such as the seminal vesicles, prostate gland and the bulbourethral glands, which form the bulk of semen.