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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 moves and stabilizes the shoulder joint. The movements of the different deltoid parts can interact both synergistically and antagonistically depending on the specific part and the position of the humerus. The deltoid is the most important abductor of the shoulder joint. The abduction is mainly initiated and held by the acromial part. Both the clavicular and spinal parts function as adductors up to 60Â° and abductors over 60Â°.