the diagram shows a simple description of a human <a href="https://en.wikipedia.org/wiki/spermatozoon" class="extiw" title="en:spermatozoon">spermatozoon</a> with special detail of the head.
Translated by <a href="//commons.wikimedia.org/wiki/User:Snek01" title="User:Snek01">Michal Maňas</a>, based on image by <a href="//commons.wikimedia.org/wiki/User:LadyofHats" title="User:LadyofHats">Mariana Ruiz</a>
I did the diagram myself based on the one found on the book "Gray's anatomy" 36th edition, Williams &amp; Warwick, 1980; and a diagram found of the review "Formation and organization of the mammalian sperm head" from Kiyotaka Toshimori and Chizuro Ito. (Chiba, Japan).