(Chapter 16) Footnote 31:

Vesalius refers marginally to De ossibus and the eighth book of De anatomicis administrationibus. But his criticism of Galen cannot be confirmed from our texts of these works, as Galen does not specify the location of the facets to which the ribs are articulated. See De ossibus §760: “The transverse processes ... above the tenth [thoracic vertebra] slope downward, those following it upward. Those of the tenth only incline neither way. For this 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.”(tr. Singer 1952, p. 772). In De anat. adm. §654, Galen says “Each rib articulates behind with a thoracic vertebra by a double joint, above with the body of the vertebra, below with the apophyses at the sides in a vertical row. Thence the ribs slant forward and downward for most of the way ...” (Tr. Singer 1956, p. 202).