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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.
In large, flat muscles the tendon is often a flattened sheet called an aponeurosis. Cords of connective tissue also bind bone to bone across joints; these are called ligaments. The two attachments of a muscle are called the origin and the insertion. The end of a muscle which is nearer to the midline of the body, which is more proximal, or less movable is called the origin. The end of a muscle furthest from the dorsal midline, more distal or more movable is called the insertion.