This is a lithograph plate from Gray's Anatomy. Unless stated otherwise, it is from the online edition of the 20th U.S. edition of Gray's Anatomy of the Human Body, originally published in 1918. Online editions can be found on Bartleby and also on Yahoo!.
Caption: Oblique section of left intertarsal and tarsometatarsal articulations, showing the synovial cavities.
This image is in the public domain because its copyright has expired. This applies worldwide.
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1923.
This image might not be in the public domain outside of the United States (this especially applies in Canada, China (not Macao or Taiwan), Germany or Switzerland). The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.