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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 acromion is a projection from the scapula (shoulder blade) and is located on the top and front (antero-superior) of the shoulder. It can be felt as a bony tip on the top of the shoulder. The acromion is like a âroofâ over the rotator cuff. The acromion serves as the attachment of the deltoid muscle. The deltoid muscle extends from the acromion to the upper humerus and is a main elevator of the arm.