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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.
1 The large deltoid muscle provides the characteristic contour of the shoulder and is the largest, strongest muscle of the shoulder. 2  It originates in three portions, the anterior, middle and posterior portions. 3  The anterior portion arises from the anterior border and superior surface of the clavicle. It also draws the shoulder downward and backward and keeps the inferior angle of the scapula against the chest wall. 2  Side (lateral) muscles of the shoulder: 3  The large deltoid muscle provides the characteristic contour of the shoulder and is the largest, strongest muscle of the shoulder.