From stages XII–VI, spermatids (steps 12–16 ... deep penetration of the Sertoli cells by the spermatid bundles. As spermatogenesis progresses, the bundling of the elongating spermatids ...

The final phase, spermatogenesis, culminates in the production of mature sperm cells capable of fertilizing an egg. While the early and final phases of this process have been successfully ...