Illustrations of the azygos vein.
Original file: https://en.wikipedia.org/wiki/File:Azygos_vein.png
Diagrammatic images from Grays (20th ed): out of copyright.
Original file: https://en.wikipedia.org/wiki/File:Gray480.png
Diagrammatic images from Grays (20th ed): out of copyright.
Case Discussion
License: This faithful reproduction of a lithograph plate from Gray's Anatomy, a two-dimensional work of art, is not copyrightable in the U.S. as per Bridgeman Art Library v. Corel Corp.; the same is also true in many other countries. Unless stated otherwise, it 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. Other copies of Gray's Anatomy can be found on Bartleby.