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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.
Interesting facts about the deltoid muscle: 1  Pain around the shoulder area caused by the deltoids muscles will subside when resting. If the pain in the deltoid area is continuous even at rest, chances are the source of the pain is being caused by other muscles in the neck, shoulder, upper back, and/or chest.