"On the Anatomy of Muscles": In this work, Galen incorporates all his previous knowledge in the field of muscle anatomy, corrects the mistakes of earlier scholars, and enumerates his own discoveries in this field.
"On the Motion of Muscles": The movement of muscles: the basic elements of how muscles move and the resolution of certain problems that arise regarding muscle movement, along with a critique of various other erroneous theories circulating at that time on the same subject.