(Chapter 18) Footnote 88:

Vesalius cites chapter 8 of On the Bones in the margin. Speaking of the neck vertebrae, Galen says β€œIt is not by cartilage that they are united β€” as some think β€” but by the membrane that covers the two meninges of the spinal marrow insinuating itself into the space between [every] pair [of vertebrae] and binding them together. So with all the vertebrae except the two first.” (756.5-10, tr. Singer 1952, p. 772).