Human testicle. Illustration from Anatomy &amp; Physiology, Connexions Web site. <a rel="nofollow" class="external free" href="http://cnx.org/content/col11496/1.6/">http://cnx.org/content/col11496/1.6/</a>, Jun 19, 2013.
OpenStax College
CC BY 3.0
Anatomy &amp; Physiology, Connexions Web site. <a rel="nofollow" class="external free" href="http://cnx.org/content/col11496/1.6/">http://cnx.org/content/col11496/1.6/</a>, Jun 19, 2013.