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The shoulder is composed of the clavicle (collarbone), scapula (shoulder blade) and humerus (upper arm bone). The roof of the shoulder is formed the acromion. The shoulder actually has two joints to facilitate its movement.The acromioclavicular (AC) joint is located between the acromion and clavicle. The glenohumeral joint, or shoulder joint, is a ball-and-socket joint where the top of the humerus (the ball) fits into the glenoid cavity of the scapula (the socket). Muscles, tendons, and ligaments hold these bones together. Articular cartilage covers the surface of the shoulder joint, allowing the bones to glide smoothly and protects and cushions the joints.

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