“肩” (shoulder) is a part of the human body located at the junction of the arm and the torso. It consists of bones, muscles, and tendons that allow for a wide range of motion. The shoulder joint is one of the most flexible joints, enabling movements such as lifting, rotating, and reaching. In addition to its functional role, the shoulder is also important for posture and balance. It supports the upper body and helps in various activities, from everyday tasks to sports. Injuries to the shoulder, such as strains or dislocations, can significantly impact mobility and quality of life.