The prostate is a variable-sized gland located in the male pelvis, usually the size of a walnut measuring 3-4 Centimetres long and 3-5 centimetres width. On average the gland weighs about 20 grams. The prostate surrounds the urethra, which carries urine from the bladder to the penis. The seminal vesicles attach to the prostate and produce material that mixes with the prostatic fluid to form semen. The tubes from the testicles carry sperm to the prostate where the sperm are mixed with the prostate and the seminal vesicle fluid. The fluid is then ejaculated during orgasm by a connection to the urethra called the ejaculatory ducts.
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