The term spermatogenesis is formed from the Greek words sperma meaning sperm and genesis meaning origin. It means sperm production. The process by which sperm are produced in the testicles of sexually fertile males is called spermatogenesis. Sperm arise from germinal epithelial cells located in the seminiferous tubules. Somatic or Sertli cells provide nutrients to the sperm. Spermatogenesis process takes 60-70 days.