MICROSCAPE / SCIENCE PHOTO LIBRARY MICROSCAPE / SCIENCE PHOTO LIBRARY
Light microscopy of a fetal testis. The characteristic features are i) the solid seminiferous cords that in postnatal life will become seminiferous tubules, and ii) the relatively high proportion of Leydig cells between the cords which will diminish in quantity in postnatal life. The cords contain mostly Sertoli cells and fewer spermatogonia (round cells). The spermatogonia will become the stem cells for subsequent sperm development during spermatogenesis. Magnification x200 when printed at 10 cm height.
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