Outline the processes involved in spermatogenesis within the testis, including mitosis, cell growth, the two divisions of meiosis and cell differentiation
Spermatogenesis is the production of mature sperm cells. Diploid somatic cells are called spermatogonium, and are located in the outer layer of the seminiferous tubules. After Prophase of Meiosis I, the spermatogonium becomes a primary spermatocyte (still diploid). At the conclusion of meiosis I, the cell is divided into two haploid secondary spermatocytes. After meiosis II there are four spermatids. Spermatids are haploid, and mature into sperm cells and are nourished by the Sertoli Cells. Sperm cells spend about 21 days, or three weeks, in the epididymis before they become fulling functional. Spermatogenesis is a continuous process.