We often hear Semen referred to as "Sperm". But, the sperm cells (spermatozoa) are only about 5-10% of it. In that 5-10% there are normally 200-500 million sperm cells. Still, it takes only one sperm cell to fertilize a human egg.
Sperm cells come only from the testicles. They take over 70 days to develop.
Seminal plasma is made by the seminal vesicles. It makes up about 46-80%. The seminal vesicles also create prostaglandins (hormone-like chemicals that regulate cellular activities).
Prostate fluid is obviously from the prostate gland. It makes up about 14-33%. It is a thin, milky, alkaline fluid. This fluid neutralizes the acidic fluid of the vagina and uterus. This neutralization protects the sperm cells and keeps them alive.
Pre-cum is made by the bulbourethral glands (also called: Cowper's glands). This, along with some fluids from the glands of the urethra, makes up about 2-5% of the total fluid. The pre-cum lubricates the urethra so the ejaculate can move easily through the penis.
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