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Deltoid Muscle Anatomy and Function

The deltoid muscle is the main muscle of the shoulder. A triangle-shaped muscle, it helps move your upper arm and stabilizes the shoulder joint.

Source: Verywell Health

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  • American Academy of Orthopaedic Surgeons
  • American Shoudler and Elbow Surgeons
  • American Orthopaedic Society for Sports Medicine
  • Arthroscopy Association of North America Advancing the scope