(Chapter 26) Footnote 31:

The 1555 ending of this chapter replaces the 1543 version beginning at this point: “So also the metacarpal bone that supports the index finger puts forth a noteworthy process (above 6 in ch. 25, fig. 1) to the inner side of the hand where it is articulated to the carpus; into this, the second [m. flexor carpi radialis] (L in the 3rd table of muscles) of the muscles that move the carpus is inserted. The metacarpal placed before the little finger protrudes somewhat (above N in figs. 1, 2, ch. 25) on its outer side where it is joined to the carpus, for convenience in admitting the insertion of the tendon of the third [m. flexor carpi ulnaris] (C in the 9th table of muscles) of the muscles that move the carpus. Also, the bones supporting the index and middle fingers are wide (above 5, 6, 7 in fig. 2, ch. 25) and rough on their outer side at the carpus to receive the forked tendon of the fourth muscle [m. extensor carpi radialis] (L in the 11th table of muscles) moving the carpus, which is quite clearly seen to divide and then lie hidden, as it would be inappropriate for a simple, round muscle to be inserted in a single process and make it bulge out beyond the convex outer surface of the carpus and metacarpus.”