Unless stated otherwise, this image is from the 20th U.S. edition of Gray's Anatomy of the Human Body, originally published in 1918 and therefore lapsed into the public domain. A copy of Gray's Anatomy can be found on Bartleby and also on Yahoo!.
La bildo estas kopiita de wikipedia:de. La originala priskribo estas: Anatomie des Skrotums Henry Gray (1825–1861). Anatomy of the Human Body. 1918. *Quelle: http://www.bartleby.com/107/illus1143.html, Legenden übersetzt *Lizenz: Public domain