Final answer:
Sperm travel to the tail of the epididymis once they leave the testes, where they gain motility and are stored until ejaculation.
Step-by-step explanation:
Once the sperm leave the testes, they travel to the tail of the epididymis. The epididymis is divided into three parts: the head, the body, and the tail. The tail is where the more mature sperm are stored until ejaculation. During their transit through the epididymis, sperm gain motility, which is essential for their ability to swim up the female reproductive tract to reach an egg.