From the case:
First cervical vertebrae (Gray's illustration)
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Superior axial view of the first cervical vertebra, or atlas (C1).
Case Discussion
License: Original diagram reproduced from Gray's Anatomy of the Human Body 20th ed., published in 1918 and therefore has lapsed into the public domain.
Image retrieved from (https://www.bartleby.com/107/illus86.html).
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