(Chapter 16) Footnote 34:

Vesalius notes in the margin “often in other places, but especially in the eighth book of De anatomicis administrationibus,” in the first chapter of which Galen writes “Each rib articulates behind with a thoracic vertebra by a double joint, above with the body of the vertebra, below with the apophyses at the sides in a vertical row.” (§654, tr. Singer 1956, p. 202).