Figure 73 from Duchenne's 1862 monograph Mécanisme de la physionomie humaine, a pioneering work exploring the muscles of facial expression, work which involved the triggering of muscular contractions with electrical probes.
Figure 73 from Duchenne's 1862 monograph Mécanisme de la physionomie humaine, a pioneering work exploring the muscles of facial expression, work which involved the triggering of muscular contractions with electrical probes.