3.The bulk of the epididymis consists of the enormous duct of the epididymis, which, believe it or not, could be uncoiled to stretch about six meters — though I don't suggest doing that.
4.From there, the sperm — although still immobile — leave the testes, by way of the epididymis, a long, tangled set of tubes behind the testes where they'll spend the next few weeks gaining their mobility.
5.At this point they have the hardware to swim, but still lack the ability to actually move on their own, a skill kept under wraps until they leave the epididymis and get activated by a series of glandular secretions.
6.When that time comes, during ejaculation, the sperm flow from the epididymis through the vas deferens, a tube that travels up behind the bladder and joins with the duct from the seminal gland to create the ejaculatory duct.