Spermatogenesis is the process by which sperm cells develop from stem cells in the seminiferous tubules of the testes. It begins with the mitotic division of spermatogonial stem cells into primary spermatocytes, which then undergo meiosis to form haploid spermatids. The spermatids develop tails and mature into spermatozoa through spermiogenesis. Sertoli cells support this process by maintaining the environment, secreting substances, and protecting the developing cells. Spermatogenesis is regulated by hormones like testosterone and FSH and sensitive to fluctuations in temperature.