(Chapter 15) Footnote 32:

The Greek text as transmitted in Kühn’s 1821 edition does not fully bear out Vesalius on this point. See the seventh chapter, §456: “the skull had to be attached to the second vertebra so that the head could be thrown back,” and the eighth chapter, §463: “the head turns the second vertebra with itself in the [lateral] direction it moves by means of the ligament.” tr. Singer 1956, pp. 110, 113.