Spermatogenesis is the process by which haploid spermatozoa develop from the diploid spermatogonial germ cells.
This process starts with the mitotic division of the diploid spermatogonial germ cells located close to the basement membrane of the seminiferous tubules of the testicle.
The mitotic division of these produces two types of cells.
Type A cells replenish the stem cells.
Type B cells differentiate into primary spermatocytes.
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Meiotic division in female oogonia occurs in utero; meiosis of spermatogonia in males occurs after puberty.