From the case:
Sacrum (Gray's illustration)
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Sacrum.
Case Discussion
Original diagrams from Gray's anatomy, now out of copyright. These diagrams have been reproduced from Gray's Anatomy 20th US edition which has now lapsed into the public domain:
- https://commons.wikimedia.org/wiki/File:Gray95.png
- https://commons.wikimedia.org/wiki/File:Gray96.png
- https://commons.wikimedia.org/wiki/File:Gray97.png
- https://commons.wikimedia.org/wiki/File:Gray98.png
- https://commons.wikimedia.org/wiki/File:Gray99.png