This is a left lateral view displaying some of the deeper muscles of the musculoskeletal system. In addition there is a lateral view of the brachium (arm), including the shoudler and elbow joints, displaying the brachialis and biceps brachii muscles.
Ellenberger, Wilhelm, Hermann Baum, and Hermann Dittrich. 1898. Handbuch der Anatomie der Tiere für Künstler. Leipzig: Dieterichsche Verlagsbuchhandlung.