HISTORY OF THE PROSTATE GLAND The prostate is a gland that is located just underneath the bladder. It surrounds the urethra through which a man urinates. The prostate gland is therefore vital to proper bladder control and urine flow-rate. The prostate is also essential for normal sexual function. It is the gland of ejaculation, supplying 95% of the seminal fluid and the power to push it through the urethra and out of the penis. The normal prostate in an adult man is about the size of a walnut. Its size often increases over time, however, particulary once a man gets beyond age 40. Because the urethra runs right through the middle of it, a growth spur