The term "prostate", originally derived from the Greek word prohistani which means "to stand in front of," has been attributed to Herophilus of Alexandria who used the term in 355 B.C.E. to describe the small organ located in front of the bladder (17). The prostate gland is a small firm organ, about the size of a chestnut, located below the bladder and in front of the rectum. The urethra, the channel through which urine is voided, passes from the bladder and through the prostate and penis. The primary function of the prostate gland, which contracts with ejaculation, is to provide enzymes to maintain the fluid nature of seminal fluid and to nourish sperm as they pass through the the prostatic and penile urethra to outside the body.