Morphological changes in sperm are one aspect of a maturation process during epididymal transit in mammals. The literature mentions only, for different strains of rats, a remodeling and decrease in size of the acrosome. In the present work, the sperm were obtained from caput, corpus, and cauda epididymis of the albino rat. Samples were processed for scanning electron microscopy, with routine techniques, and for light microscopy and video microscopy. It appeared, with these techniques, that the acrosomal curvature and the whole head surface area of the rat sperm decrease during the epididymal transit. To measure these changes, a geometrical method was designed, and surface measurements were made using a computer program. It was found that the caput sperm head has the greatest surface area and a sharper acrosome bend than the cauda sperm. In an attempt to explain the above-mentioned changes, the suggestion is offered that some compactation of the nucleus and acrosomal material could be related to the decrease of the surface area.
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