prime mover

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prime mover

 
a muscle that acts directly to bring about a desired movement.

prime mover

[prīm]
Etymology: L, primus + movere, to move
a muscle that acts directly to produce a desired movement amid other muscles acting simultaneously to produce the same movement indirectly. Most movements of the body require the combined action of numerous muscles. Compare antagonist, fixation muscle, synergist.

prime mover,

n that muscle which is primarily responsible for producing a particular movement.
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