(Chapter 6) Footnote 124:

In De ossibus 766.9-12 Galen describes the diarthrosis of the acromion and clavicle: “Some anatomists call this combination acromion, but others maintain that besides these two conjoined bones there is a third bone, found only in man, which they also call katakleis or acromion” (tr. Singer, op. cit.). Vesalius’ reference to Hippocrates is perhaps sarcastic. Rufus Ephesius (1-2 cent. A.D.) De corporis humani appellationibus 3.72-74 ascribes the discovery of this third bone to one Eudemus, probably the Alexandrian physician often cited by Galen and mentioned in the previous note as one of Vesalius’ “pleiad.”