What happens during spermatogenesis?

Spermatogenesis (Greek: sperm = germ, genesis = origin, genesis) means the process of formation of male germ cells (sperm).
In puberty, during the first meiotic phase, the primary spermatocytes first double. From a primary spermatocyte, therefore, two secondary spermatocytes.
This is followed by the second meiotic phase, during which four spermatids emerge from the two spermatocytes. Spermatids are not yet finished sperm, because they lack u.a. or a flagellum with which they can move. Spermiogenesis completes the process of spermatogenesis: four spermatozoa have emerged from a spermatocyte