From the case:
Base of skull (illustration)
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Base of skull diagram. Image created by Patrick J. Lynch, and distributed under Creative Commons Attribution 2.5 license - see case page for more info. Skull base, drawn by Patrick J. Lynch, flipped by up-loader. 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).