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The deltoid muscle is located on the outer aspect of the shoulder and is recognized by its triangular shape. The deltoid muscle was named after the Greek letter Delta due to the similar shape they both share. The deltoid muscle is constructed with three main sets of fibers: anterior, middle, and posterior.
The upper part of the deltoid muscle attaches to the lateral, or outermost, part of the clavicle and the spine of the scapula, which is a large ridge running across the shoulder blade. The lower part of the deltoid attaches to the deltoid tuberosity, which is a bony bump on the upper portion of the humerus.The deltoid is divided into three parts: anterior (front), middle and posterior (back). Each part moves the arm, but in different directions.he posterior part of the deltoid moves the arm in the opposite direction of the anterior deltoid. It extends and laterally rotates the arm. You extend your arm when you move it straight behind you, and you laterally rotate your arm when you turn the front of the arm bone away to the side.