TISSUEPIX / SCIENCE PHOTO LIBRARY TISSUEPIX / SCIENCE PHOTO LIBRARY
Seminiferous tubule. Light micrograph of a section through a testis showing part of a seminiferous tubule. The seminiferous tubules are the site of sperm production (spermatogenesis). Sperm cells are made up of a head, containing genetic material, and a tail. Mature sperm cells can be seen closest to the tubule's lumen (upper centre, white). Moving away from the lumen are increasingly immature precursor cells; first spermatids, then spermatocytes and finally spermatogonia. The outermost cells are sertoli cells, which nourish the maturing sperm. Magnification: x400 when printed at 10 centimetres wide.
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