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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 a muscle which covers the shoulder joint. The deltoid itself is divided into three parts which are the anterior or the front part, the middle part, and the posterior or the back part. The deltoid stems from the lateral part of the acromion and clavicle and goes into the lateral aspect of humerus.