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. 2015 Sep 8;2015:798754. doi: 10.1155/2015/798754

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Copyright © 2015 Giuseppe Ricci et al.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Optical and ultrastructural images of round-headed sperm. (a) Thin section, optical microscopy; ((b), (c), and (d)) SEM view showing round-headed sperm (arrows) and some apparently without tail (arrowheads); (e) a conical neck (arrowhead); (f) a thick midpiece (arrow) and a cord structure at the head side (arrowhead); ((g), (h)) round heads and nuclei, anomalous axoneme in the midpiece (arrow); (i) a bending tail; (j) a detached nuclear envelope and a lacunar chromatin defect; (k) a binucleated head; (l) five axoneme sections enclosed in the same head. ((b) and (c)) White scale bars = 5 μm; (d) white scale bar = 3 μm; ((e) and (f)) white scale bars = 1 μm; ((g), (h), (j), (k), and (l)) black scale bars = 1 μm.