Where are mature sperm stored in the male reproductive system?

Mature sperm are stored in the epididymis, which is a coiled tube that runs along the back of each testis. This structure plays a crucial role in the maturation of sperm cells, allowing them to gain the motility needed for fertilization. As sperm travel through the epididymis, they undergo various changes that prepare them for their journey through the male reproductive system and eventual fertilization of an egg.

The seminiferous tubules are where sperm are produced through a process called spermatogenesis, but mature sperm are not stored there. The prostate gland is involved in the production of seminal fluid and plays a role in ejaculation but does not serve as a storage site for mature sperm. The scrotum is the external pouch that holds the testes, providing a temperature-controlled environment for sperm production but is not a storage location for mature sperm themselves. Thus, the epididymis is the correct answer, as it specifically serves the function of storing and maturing sperm until they are ready for ejaculation.