(Chapter 38) Footnote 27:

Vesalius cites here “especially” Book 8 of Galen’s De usu partium. For the confusion of glottis and epiglottis, see May p. 688 n. 16. Galen’s principal discussion of the glottis falls in 3.562-567, May pp. 357-361, of the epiglottis in 3.586-588, 594, May pp. 372f.