- 1. Germ cell - primordial stem cell (diploid) -differentiate into spermatogonia in utero
- 2. Spermatoginia - emain dormant until puberty - diploid cell - attached to basement membrane of seminifierous tubules
- - undergo mitosis - duplicate cells lose contact with basement membrane & squeeze through blood-testis barrier
- - differentiate into primary spermatocytes
3. Primary spermatocytes - diploid cells - undergoes Meiosis I - results in 2 haploid cells (with attached sister chromotids) called Seconday spermatocytes
4. Secondary spermatocytes - haploid cells (with 23 sister chromotids) that enter Meiosis II → 4 haploid cells called spermatids
5. Spermatids -4 haploid cells that undergo spermiogenesis → transforms into long slender shape and becomes a spermatazoa (sperm cell) - spermiogenesis starts in the testes and ends in the epididymis - Maturation in the epididymis takes two weeks.
6. Spermatazoa = mature sperm cell