(Chapter 27) Footnote 11:

This section is based largely on a corresponding passage in Galen’s De usu partium 3.39.12-41.7 (May 1968, pp. 86f.), except as we shall see Vesalius dwells on the difference between the shape of the bones and that of the fingers themselves, taking issue with Galen’s characterization of the phalanges as round or cylindrical (see n. 29 below).