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Muscles are arranged in such a way that whatever one muscle can do, other muscles can reverse. Because of this, muscles are able to bring about an immense variety of movements. Prime mover. The muscle that has the major responsibility for causing a particular movement is called the prime mover. Antagonists. Muscles that oppose or reverse a movement are antagonists; when a prime mover is active, its antagonist is stretched and relaxed. Synergists.
Shoulder Horizontal Adduction (Horizontal Flexion) 1  Prime Mover: Pectoralis major. 2  Synergists: Anterior deltoid. 3  Antagonists: Posterior deltoid.  Neutralizers: Posterior deltoid, infraspinatus, and teres minor neutralize internal rotation force created by the anterior deltoid and pectoralis major.