(Chapter 16) Footnote 26:

See De usu partium 4.78-83. Galen says three times in the chapter cited by Vesalius only that the last two dorsal vertebrae lack transverse processes: 1)”These are the only ones of all the vertebrae not to have the oblique outgrowth on each side which I called transverse before.” (4.78.4-5, tr. May 1968, p. 588); 2) “Now the last two of the dorsal [thoracic] vertebrae, those below all the others, not without reason have instead of transverse outgrowths the downward-slanting [accessory] outgrowths that lie beneath the joints. For one of these vertebrae has resting upon it the last of the false ribs, which is very short and slender and moves only a little and weakly; the other has the diaphragm growing out from it. Hence they did not, like the other thoracic vertebrae, need strong transverse outgrowths supported by, and safely articulated with, the parts of the bones of the ribs in this region, but have instead of the transverse outgrowths those slanting downward, as in the neighboring lumbar vertebrae.” (4.81.20-82.13, tr. May, 1968 pp. 589-590); 3) “The two following vertebrae [the eleventh and twelfth] were deprived of their transverse outgrowths ...” (4.83.20-22, tr. May 1968 p. 590). Vesalius deleted this criticism of Galen from the 1555 edition.