Brain of a four-week old human embryo.
<a href="//commons.wikimedia.org/w/index.php?title=User:Kurzon&amp;action=edit&amp;redlink=1" class="new" title="User:Kurzon (page does not exist)">Kurzon</a>
2007-11-01
<span class="int-own-work" lang="en">Own work</span>