(Chapter 15) Footnote 26:

The opening of this section was rewritten as follows for the 1555 edition: “The human neck consists of seven vertebrae; I shall include in my account of them that part of the occiput as well which is articulated to the first vertebra, and which has a single capitulum next to each side of the foramen by which the dorsal medulla drops into the spine, tending more toward the anterior part of the foramen than the posterior.”