Pathway of Sperm | Male Reproductive System |
Sperm make up less than 5 percent of semen volume. As they pass from the seminiferous tubules into a long duct called the epididymis, they undergo further maturation to become motile and fertile before entering the vas deferens, a muscular tube that joins the duct of the seminal vesicle (behind the bladder) to form an ejaculatory duct.
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The seminal vesicle adds a fructoserich solution that provides energy and nutrients for the sperm, and
contributes around two-thirds of the total semen volume.
It is highly alkaline (to counteract vaginal acidity) and contains prostaglandins, which dampen vaginal immune responses to semen. As semen enters the urethra, the prostate gland contributes a slightly alkaline fluid that makes up around a quarter of the seminal fluid. Finally, Cowper’s gland secretes a fluid (comprising less than 1 percent of the total volume) to lubricate the urethra and flush out any urine before ejaculation.
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