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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 Muscles (also known as Deltoids or Delts for short) are a group of triangular muscles which most people would recognize as the shoulder muscles and are located on top of the common shoulder joint for the Scapula, Clavicle and Humerus..The posterior division, also known as the posterior deltoid, is located on the backside of the shoulder joint. The Deltoid Muscles consist of three divisions highlighted in this picture. Typically, there is a combination of these divisions which work together to produce specific movements.