(Chapter 16) Footnote 13:

Variants of supra infraque suscipi, utrinque suscipitur, etc., repeated several times in this chapter, refer to the articulation of the thoracic vertebra (the twelfth in Vesalian and modern anatomy) whose superior and inferior articular processes are both convex. Hence it is “received (or supported) on both upper and lower sides.” It is a special concern of Vesalius because he wished to emphasize Galen’s error in attributing this feature to the tenth thoracic vertebra, which would be normal only in quadrupeds and simians.