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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 inferior, lateral and anterior structures of the shoulder joint are supplied primarily by the axillary nerve, a branch of the posterior cord, which also supplies the deltoid and has fibres to teres minor. Intramuscular lipoma of the deltoid causing shoulder pain: report of two cases. The deltoid point is 7 cm long, 6 cm wide and 4 cm thick and is colored black. The rotator cuff is a group of four muscles and tendons that lies just beneath the deltoid muscle (which raises the arm) and stabilizes the shoulder joint.