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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 muscle is the muscle that gives the shoulder its rounded shape. Many mammals have this muscle, as the design is very efficient, and this muscle is responsible for the abduction of the shoulder and some of the rotation of the arm or limb.he deltoid muscle is responsible for the shoulder's rounded shape. The military press strengthens the deltoids, or shoulders muscles, and other muscles of the upper body. Deltoid muscles contain three parts: posterior, anterior and lateral. View slideshow of images above.