Sperm Production

Sperm is continually produced in the testicles, then moves through small tubes (efferent tubules) to the epididymis. Within this structure, the sperm matures, until they have become motile and are able to fertilise the female egg. This may take several months.


Basic Anatomy

During ejaculation, the mature sperm moves from the epididymis, through the vas deferens (a thick muscular tube) to the urethra, mixing with fluids from the prostate and seminal vesicles to form the ejaculate (semen).


basic diagram of sutured end of vas deferens

During a vasectomy, a small section of the vas deferens is surgically removed and the ends sutured closed. This blocks the movement of sperm from the epididymis to the urethra