A Spermatogonium (plural: spermatogonia) is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa. These germ cells can be divided into Type A, In (intermediate), and Type B Spermatogonia. Included in the Type A spermatogonia are a subset of cells from which all germ cells are derived; the Spermatogonial Stem Cells. Spermatogonia are the primitive differentiated male germ cells which give rise to primary spermatocytes, through the first meiotic division. Spermatocytes are diploid cells which divide by a second round of meiosis to produce the haploid round and elongated spermatids and finally mature spermatozoa.

Source: This article includes material from Biology Online.

Germ cells