Multiplication Phas - Stages of spermatogenesis
The initial cells in the germ line arc known as primordial germ cells (PCC). The PGC, which arise at some distance from the prospective gonads migrate into them and arc known as stem cells. The stem cells divide by mitosis and give rise to spermatogonial cells. The multiplication phase marks the production of a number of spermatogonia inside the testis.
Figure: Stages in spermatogenesis