From the case:
Lateral head anatomy (illustration)
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Lateral view of the head, with muscles of facial expression and muscles of mastication. Image created by Patrick J. Lynch, and distributed under Creative Commons Attribution 2.5 license - see case page for more info.
Case Discussion
This file is licensed under Creative Commons Attribution 2.5 License
In short: you are free to distribute and modify the file as long as you attribute its author(s) or licensor(s).
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