How do testicles store sperm?

Shortly before ejaculation the sperm in the ampulla is mixed with secretions from the prostate, seminal vesicles and the bulbourethral glands to form semen, this process also 'activates' the sperm to swim. After each ejaculation the testicles need to fill again the ampulla. This can take 2-3 days before being completed. read more

Testicles, also called testes or balls, are oval-shaped organs that sit in a sac that hangs behind the penis. The main job of testicles is to make and store sperm and produce testosterone. Testosterone is the male hormone that's responsible for the changes that occur during puberty. read more

Testicles produce sperm and the hormone testosterone. Sperm grows at the back of the testicle, in the epididymis. The testicles hang in a sack, called the scrotum, that sits outside of the body because it is necessary for sperm to be stored at a temperature that is slightly below that of the body. read more