(Chapter 18) Footnote 43:

See In Hippocratis librum de articulis et Galeni in eum commentarii 18a.493.5-11: “I have given an exact account of the entire composition of the vertebrae in my introductory work De ossibus, in respect to which I thought it best to exercise the student thoroughly with these notes, having exactly observed the nature of each of the bones, particularly on human skeletons, or at any rate those of apes.”