(Chapter 4) Footnote 69:

Vesalius’ new account of hinges, and his new illustration, were in response to John Caius’ criticism in Galeni libri aliquot (1544, pp. 298-99) that the type of hinge illustrated in the 1543 Fabrica was inappropriate. Caius’ substitute illustration, showing a different type (a strap hinge), was borrowed without attribution and shown above the 1543 hinge in the 1555 Fabrica. See O’Malley 1964, p. 274.