Muscle Actions definitions Flashcards
Muscle Actions definitions
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Agonist The main muscle responsible for a movement, such as the biceps brachii during elbow flexion. Prime Mover Another term for agonist, the primary muscle driving a specific movement. Antagonist A muscle that opposes the action of the agonist, like the triceps brachii during elbow flexion. Synergist A muscle that aids the prime mover, enhancing the movement, such as the brachialis assisting the biceps brachii. Fixator A muscle that stabilizes the origin of the prime mover, ensuring effective movement, like the rotator cuff stabilizing the humerus. Biceps Brachii A major muscle of the upper arm, acting as the agonist during elbow flexion. Triceps Brachii A muscle located at the back of the arm, acting as the antagonist during elbow flexion. Brachialis A muscle that works as a synergist to the biceps brachii during elbow flexion. Rotator Cuff A group of muscles on the scapula that stabilize the humerus during arm movements. Elbow Flexion A movement involving bending the arm at the elbow, primarily driven by the biceps brachii. Muscle Contraction The process by which a muscle shortens, causing movement at a joint. Origin The fixed attachment point of a muscle, which does not move during contraction. Insertion The movable attachment point of a muscle, which moves during contraction. Humerus The bone of the upper arm, stabilized by the rotator cuff during certain movements. Scapula The shoulder blade, serving as the origin for the rotator cuff muscles.
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