APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The muscle primarily responsible for a movement is called the prime mover, and muscles that assist in this action are called synergists. A synergist that makes the insertion site more stable is called a fixator. Meanwhile, a muscle with the opposite action of the prime mover is called an antagonist.

Detailed explanation-2: -During flexing of the forearm, the brachioradialis and brachialis act as synergist muscles, aiding the biceps brachii in pulling the forearm up towards the shoulder. The muscles of the rotator cuff are also synergists in that they fix the shoulder joint allowing the bicepps brachii to exert a greater force.

Detailed explanation-3: -Answer and Explanation: The term for the muscles that help prime movers by adding a little extra force to the same movement are called synergists. Synergists help stabilize a joint where the action is occurring and may also assist in creating the movement.