(Chapter 23) Footnote 10:

Vesalius refers in the margin to De usu partium. See 3.121.4 (May 1968 p. 131), where the humerus and the femur are called “the largest of the members.” See also De ossibus 767, where Galen calls the humerus “the largest bone except the femur.” (tr. Singer 1952, p. 773).