Spermiogenesis is the final stage of spermatogenesis, the process by which male gametes, or sperm cells, are produced. During spermiogenesis, round spermatids transform into elongated spermatozoa. This transformation involves significant changes, including the development of a tail, condensation of the nucleus, and the formation of the acrosome, which contains enzymes necessary for fertilization. This process occurs in the seminiferous tubules of the testes and is crucial for male fertility. Spermiogenesis is regulated by various hormones, including testosterone, and typically takes about 64 days to complete. The resulting sperm cells are then stored in the epididymis until ejaculation.