Sperm

The term sperm is short for spermatozoon and represents the male sex cell, or gamete, that contains the genetic information that needs to go from the male to the egg of the female. dictionary.webmd.com/terms/sperm These cells are created in the testes which are located in the scrotum of the male and hang immediately below the penis. The sperm begins in the somniferous tubules and then makes its way into the epididymus which is located on top of the testes and contains the cells until they mature and are then needed. Once ejaculation begins the gametes make their way through the vas deferens through the ampulla where it is mixed with seminal fluid from the seminal vesicle and into the ejaculatory ducts and thence are propelled into the prostate gland where the fluid is mixed with prostatic fluid to become semen before pushing its way into the urethra and out of the penis. health.howstuffworks.com/adam-200126.htm

The spermatozoon must be held in a very specific temperature range in order to remain viable for fertilization of the egg. In order for these conditions to be maintained the scrotum hangs free from the body but has the ability to extend and contract as conditions require. If the temperature of the testes begins to climb then the sack extends pushing the organs away from the body and allowing them to cool but if the temperature drops then the action is reversed pulling everything in closer to retain heat at a more optimum rate. www.kidzworld.com/article/1863-what-is-sperm-and-how-is-it-made

In order to achieve fertilization of an egg the human male releases over 300 million sperm cells during an ejaculation. Of these millions only about 200 will actually survive to make it into range of the egg cell. Of course of these 200 only one will actually culminate its journey and combine with the egg to concive a child. health.howstuffworks.com/adam-200126.htm