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><a href="//commons.wikimedia.org/wiki/File:Complete_diagram_of_a_human_spermatozoa.svg" class="mw-redirect" title="File:Complete diagram of a human spermatozoa.svg">Complete diagram of a human spermatozoa.svg</a>: <a href="//commons.wikimedia.org/wiki/User:LadyofHats" title="User:LadyofHats">Mariana Ruiz</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:M.Komorniczak" title="User:M.Komorniczak">Michał Komorniczak</a> (<a href="//commons.wikimedia.org/wiki/User_talk:M.Komorniczak" title="User talk:M.Komorniczak">talk</a>)</li></ul>
<a href="//commons.wikimedia.org/wiki/File:Complete_diagram_of_a_human_spermatozoa.svg" class="mw-redirect" title="File:Complete diagram of a human spermatozoa.svg">Complete diagram of a human spermatozoa.svg</a>