Timeline
Born 1806 — Died 1875
1850s
Figure 32: Natural laughter by the voluntary contraction of the two large zygomatics and the lower palpebral orbicularis
Figure 7: Étude du méchanisme et de l'expression du muscle frontal chez un vieillard: à droit, attention; à gauche, repos
Figure 54: Abaissement volontaire de la mâchoire inférieure: mouvement inexpressif