Spermatogenesis is the name given to the last phase of the formation of sperm. During this stage of maturation, cells are spermatids causing an increase in queue size and decreasing the sperm head. This series of complex transformations leading to the final end of sperm constitution which male cells are specialized in transferring the oocyte DNA. The mature sperm is released through the seminiferous tubules, which are small tubes that are within the testes, responsible for producing sperm and the hormone testosterone. The approximate duration of this process is two and a half months.