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.
<ul><li>original work: <a href="//commons.wikimedia.org/wiki/User:LadyofHats" title="User:LadyofHats">Mariana Ruiz Villarreal</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:NunoAgostinho" title="User:NunoAgostinho">NunoAgostinho</a></li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Complete_diagram_of_a_human_spermatozoa_en.svg" title="File:Complete diagram of a human spermatozoa en.svg">Complete_diagram_of_a_human_spermatozoa_en.svg</a></li></ul>