DR DON FAWCETT / SCIENCE PHOTO LIBRARY. DR DON FAWCETT / SCIENCE PHOTO LIBRARY.
Transmission electron micrograph (TEM) of a transverse section through a number of seminiferous tubules in a mammalian testis, the site of production of sperm. The testis is packed with numerous tubules which are lined by a stratified epithelium consisting of 2 distinct groups of cells; the central white area is the tubule lumen (interior). One group of cells is the spermatogenic series, ie those cells involved in both spermatogenesis (production of male gametes) and subsequent spermiogenesis (evolution of male gamete into motile spermatozoon). The other group are non-spermatogenic cells called Sertoli cells, which nourish the developing spermatozoa.
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