20: Raphael. The left arm activates
trapezius and other related muscles.
22: Raphael. Right arm bent, raised. “The
trapezius moves over the superior angle of the scapula (E),
which it holds against the rib cage, and then inserts into the
spine
and the acronmion process (N) of the scapula.”
28: Tiepolo. Left scapula retraction. Right
scapula protraction.