Sperm are produced in the seminiferous tubules in the testes. Spermatogenesis is cellular division and transformation that produces male haploid germ cells from diploid spermatogonial stem cells.

Continuous sperm production is dependent upon several intrinsic (Sertoli cells and germ cells) and extrinsic (hormonal) factors.

  • Meiosis I yields haploid secondary spermatocytes
  • Meiosis II yields four equalized spermatids that migrate toward the lumen where fully formed spermatozoa are finally relased

Spermiogenesis is when spermatids disengage excess cytoplasm and become elongated with tails.