Your shoulders are the joints where your upper-arm bones (humerus), shoulder blades (scapula), and the collarbone (clavicle) meet. The humerus fits into the rounded socket of the scapula on each side of your body. Each shoulder is held in place by a group of four muscles and tendons, called a rotator cuff, which covers and protects the humerus and lets you raise and move your arm. This book may give you: Shoulder Muscle Pain Treatment: Reverse Bad Posture Exercises To The Rescue Shoulder And Elbow Pain Treatment: Text Neck And Forward Head Posture Shoulder Internal Rotation Pain Treatment: Self-Massage Techniques To Get Rid Of Tension Headaches