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Figure 7. Schematic overview of the possible actions generated by force Fm of the superficial masseter or anterior temporalis muscle viewed in the horizontal plane. (A) Possible rotations: Rg, about center of gravity; Rr, about a vertical axis behind the right joint for a latero-deviation to the right; and Rl, about a vertical axis behind the left joint for a latero-deviation to the left. (B) Influence of joint forces: am, moment arm of muscle force; Frj, right joint force; arj, moment arm of right joint force; Fjl, left joint force; and ajl, moment arm of left joint force.
