CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Spermatogenesis. Cutaway artwork showing the internal anatomy of a seminiferous tubule in the human testis (testicle), part of the male reproductive system. This is where the male sex cells (spermatozoa) are produced in a process called spermatogenesis. The male sex cells develop in the wall of the tubule (blue, rounded), and gradually mature into the tailed form which detaches from the internal surface and becomes free-moving (centre). The sperm cells are stored and passed into the spermatic duct (vas deferens, not shown) in later stages of the reproductive process.
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