(Chapter 11) Footnote 19:

See Aristotle De partibus animalium 661b14f.: “In man the teeth are especially adapted for the purposes of speech, as regards both their character and their number, since the front teeth contribute a great deal to the formation of the sounds.” (adapted from A.L. Peck’s Loeb translation). In making his 1555 revisions for the previous chapter, Vesalius noted his belief that the hollows in the maxillary bones also contribute to voice production: see notes 36 and 56 in Chapter 9 above, and cf. his observation about the function of the nasal foramina in n,o of the figure legend of Ch. 12.