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Synergist

A muscle that assists the agonist, or cancels out an unwanted extra movement it produces.

Brachialis and brachioradialis are synergists to biceps when the elbow bends. Some sources use “synergist” and “fixator” for the same thing; this library treats a fixator as a separate, stabilising role.

Related

AgonistAntagonistFixator

Sources

  1. Wikipedia: Anatomical terms of muscle