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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 deltoid muscle is a large muscle that encompasses the shoulder joint. The deltoid is divided into three different portions, or heads, the anterior (front), middle, and posterior (back) portions of the deltoid. The deltoid originates on the lateral aspect of the acromion and clavicle and then inserts on the lateral aspect of the humerus. Its major action is to abduct the arm (lift the arm out to the side of the body) as well as assist in forward elevation (lifting the arm out in front of the body).