(Chapter 16) Footnote 49:

Our texts of these works do not appear to bear Vesalius out on this alleged discrepancy, but we must again bear in mind the corrupt state of the Greek original of De ossibus, which to make matters worse was available to Vesalius only in a Latin translation. In the 1821 Kühn edition, Galen says the tenth thoracic (not the eleventh, as Vesalius claims) “is the only vertebra to have not only its upward apophyses but also its downward terminating in condyloid ends, just as the first cervical vertebra has both glenoid, and those below the tenth the reverse.” (De ossibus §760 tr. Singer 1952 p. 772). In De usu partium Galen says of the tenth thoracic vertebra “all the vertebrae of the back and neck above this one receive and bestride with their downward-slanting outgrowths the upward-slanting ones that have been made slightly convex. But the tenth dorsal vertebra is, as I have said, the only one of them all to have both [pairs of] outgrowths moderately convex, so as to rest upon those on either side, which end in concavities with rims. ... Nature in making articulations suitable ... created in the vertebrae lying above the middle one [viz. the tenth thoracic] upward-slanting outgrowths that were convex and downward-slanting ones that were slightly concave; conversely, in the vertebrae below the middle she made the upward-slanting outgrowths concave and the downward-slanting convex.” (4.77.8-16, 79.8-14, tr. May 1968 pp. 587-588).