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The Deltoid Muscle is a muscle that surrounds the shoulder and plays a key role in arm movements. It takes its name from the Greek word "delta" (Δ) due to its triangular shape. It is also referred to as the deltoideus in some anatomical references. It functions as the main abductor muscle (elevator muscle) of the arm and contributes to the stabilization of the shoulder joint. Anatomy Morphology The Deltoid Muscle is a large, triangular-shaped muscle consisting of three distinct anatomical divisi