From the case:
Pterygoid muscles - illustration
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Diagram of the medial and lateral pterygoid muscles.
Image adapted from 1918 edition of Gray's Anatomy. http://commons.wikimedia.org/wiki/File:Musculuspterygoideusmedialis.png
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. See this page for further explanation.
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