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When a skeletal muscle contracts to cause a given movement, the more movable end of attachment of the muscle is termed its. origin. insertion. antagonist. synergist. When a muscle contracts, it usually has an opposing muscle that can cause movement in the opposite direction.
When the muscle contracts, one of the structures usually remains stationary, while the other moves. The origin of the muscle is the muscle end that attaches to the stationary structure, usually a bone or a bony structure. The insertion of the muscle is the muscle end that attaches to the moving structure. The belly of the muscle is that part of the muscle between the origin and insertion.