Which structure is responsible for storing sperm before ejaculation?

The structure responsible for storing sperm before ejaculation is the epididymis. After sperm is produced in the testis, they move to the epididymis, where they undergo maturation and are stored until ejaculation. The epididymis is a long, coiled tube located behind each testis, and it plays a crucial role in ensuring that sperm are fully developed and capable of fertilizing an egg.

The testis is primarily responsible for the production of sperm, but it does not store them. The vas deferens transports sperm from the epididymis to the urethra during ejaculation but does not serve as a storage site. The seminal vesicle contributes to seminal fluid that nourishes and helps transport sperm, but it does not store sperm itself. Therefore, the epididymis is specifically designated for the storage of sperm, making it the correct answer.