Spermatogenesis is the development of mature spermatozoa (sperm cells) from spermatogonia; it includes spermatocytogenesis and spermiogenesis.
- In the testes there are seminiferous tubules
- Seminiferous tubule surrounded by epithelium
- On epithelium are SPERMATOGONIA cells
- These are diploid cells
- Divide by mitosis
- Some remain in epithelium as more spermatogonia
- However, some move towards middle of tubule
- They grow larger and are now called PRIMARY SPERMATOCYTES
- They undergo meiosis I to create
- SECONDARY SPERMATOCYTES which are haploid
- 2-3 days later meiosis II occurs to create
- These begin to differentiate
- They are enveloped by the Sertoli Cells and undergo SPERMIOGENESIS
- This gives them their characteristic shape from a round cell to the head and elongated tail. The cytoplasm is remodeled. This creates
Note: The production of egg cells, the female counterpart to spermatogenesis, is called oogenesis.