D1 Swimmers

In spermatogenesis, “division” refers to cell division— where cells split to create new cells. The spermatozoa (mature sperm cells) are the ultimate "swimmers" due to their motility and role in reproduction. 

Spermatogenesis 

Spermatogonia are diploid (2n) cells that undergo mitotic division to maintain the stem cell pool while also producing cells destined for differentiation. The pink arrows trace the mitotic divisions that spermatogonia undergo, creating primary spermatocytes. The primary spermatocyte is represented by a larger pearl in the necklace (compared to the spermatogonia) since it absorbed more nutrients and grew in preparation for meiosis. The blue and purple arrows follow the path through meiosis I and II, where our diploid primary spermatocytes become haploid secondary spermatocytes, and then early spermatids.  The yellow arrows represent spermiogenesis – the final stage where round spermatids undergo morphological changes to become the streamlined, motile spermatozoa we recognize. This includes acrosome formation, flagellum assembly, and cellular reorganization.