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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.
1 Anterior Deltoid: This is on the front portion of your delts. 2  To get a feel for it, place your hand on the front of your delts and raise your arm up directly in front of you. 3  You should feel the anterior deltoid flexing.4  Medial Deltoid: Located on the side of your delts. Anterior Deltoid: This is on the front portion of your delts. 2  To get a feel for it, place your hand on the front of your delts and raise your arm up directly in front of you. 3  You should feel the anterior deltoid flexing.