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prime mover

A muscle that is the primary actor in a given movement, that is, the muscle that produces the movement in muscle contraction.


main muscle used to produce a movement


muscles that oppose the movement of the agonist


muscles that assist the action of the agonist


a muscle that stabilizes a joint in one position during the movement of another

circular muscle

also called sphincters; open and close to guard entrances of body; ex: orbicularis oris muscle of the mouth

convergent muscle

the muscle fibers are based over a broad area, but all fibers come together at a common attachment site.

parallel muscle

the fascicles are parallel to the long axis of the muscle. Most of the muscles in the body are parallel muscles.

fusiform muscle

Muscle that is thick in the middle and tapered at each end

pennate muscle

Muscle that is feather-shaped

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