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Illustration of Weijs's (1994) hypothesis that the primitive jaw adduction motor pattern is modified in different clades of extant mammals. The symmetric vertical closers (SVCs) include balancing- and working-side deep masseters (bDM and wDM) and anterior temporalis (bAT and wAT). (A) the primitive motor pattern; (B) the carnivore motor pattern; (C) the transverse motor pattern.
