In brief illustration, primary spermatocytes came from spermatogonium (plural: spermatogonia). These two kinds of cells are involved in the production of spermatozoa or sperm cell. These processes are collectively known as the spermatogenesis.
A spermatogonium is an undifferentiated germ cell of the male reproductive system. These immature cells are produced in the lumen and undergo three transitions. These are Type A (d) spermatocytes, Type A (p) spermatocytes and the type B spermatocytes.
A primary spermatocyte is a gametocyte of a male organism that is produced from the spermatogonia, specifically the Type B spermatogonium. It further divides to produce the secondary spermatocyte through meiotic cell division.