(Chapter 15) Footnote 82:

The 1555 edition ends this sentence as follows: “[the structure] which as a whole enables the motion of the head by which we turn it upon the second vertebra as if on an axle together with the first vertebra which is then attached to it.” Everything which comes after this point, down to the section entitled “The foramen that transmits the second pair of nerves of the dorsal medulla to the posterior” on page 68 (1543) or 80 (1555), was revised and moved to the end of the chapter in the 1555 edition. See Appendix.