(Chapter 14) Footnote 15:

Vesalius’ account continues to paraphrase Galen’s as cited in the previous note: “...first, she scooped out the interior of all the vertebrae, preparing thus a suitable pathway for the portion of the encephalon that was to descend along it, and, secondly, she did not make the whole spine from one simple, uncompounded bone. And yet this was better for a safe foundation, since it could never be dislocated, wholly, or partially, or suffer any other affection of the sort, if it were not so variously jointed. ( tr. May p. 570).