Spermatogenesis

Spermatogonia

Undifferentiated germ cells. They undergo mitosis over and over, leading to an unlimited amount of sperm potentially being made. Occasionally though, one is differentiated into a…

Primary spermatocyte

These have a diploid number of chromosomes (46). This undergoes meiosis, eventually leading to 4 haploid spermatids produced from each primary spermatocyte. The first stage makes two…

Secondary spermatocytes

These have a haploid number of chromosomes (23). They go through the final stage meiosis (which is basically mitosis), to form…

Spermatids

These haploid cells undergo differentiation (change of shape, including addition of the flagellum tail thing) to form…

Spermatozoa

Woo! The good stuff. Once made, the sperm pass through the efferent ducts into the epididymis, where the fluid is removed from the solution, leading to much more concentrated sperm. They wait at the end of the epididymis near the vas deferens for the opportunity to escape.