(Chapter 16) Footnote 14:

Vesalius cites chapter 9 of Galen’s De ossibus, where see 759-760: [The spines of the thoracic vertebrae], as far as the tenth vertebra, are very much like those of the cervical, sloping downward but from the tenth they begin to slope the other way, ...” Tr. Singer 1952, p. 772.