(Chapter 15) Footnote 67:

The odontoid process is so called by Galen in De ossibus 757.7, Vesalius’ most likely source: “Some call this the odontoid apophysis and from it Hippocrates named the second vertebra from a tooth.”(tr. Singer 1952, p. 772) Galen uses the same terminology in De locis affectis 241.1 and In Hippocratis prorrheticum i commentaria 681.7.