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Text File  |  1999-11-09  |  684b  |  10 lines
  1. The testis is organized into a network of seminiferous tubules.
  2. Within these tubules spermatogenesis occurs.
  3. Spermatogenesis is the production of mature haploid sperm cells through meiotic cell division.
  4. A spermatogonium deep in the epithelium of the seminiferous tubules gives rise to a primary spermatocyte.
  5. This cell contains 46 chromosomes.
  6. A primary spermatocyte undergoes the first meiotic division, producing two identical secondary spermatocytes.
  7. Each secondary spermatocyte contains 23 chromosomes.
  8. The secondary spermatocytes complete meiosis, giving rise to haploid spermatids.
  9. Each spermatid contains 23 chromosomes.
  10. The spermatids then develop into mature sperm.