Shoulder Anatomy
The shoulder is a ball and socket joint. The ball portion of the joint consists of the rounded head of the upper arm bone (humerus), and the socket portion is made up of a depression (glenoid) in the shoulder blade. The humeral head (ball) fits into the glenoid (socket) creating the joint that allows you to move your shoulder. The joint is surrounded and lined by cartilage, muscles, and tendons that provide support, stability, and ease of movement.
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The shoulder allows for the rotation of the arm in all directions. The range of motion is dependent on the proper articulation of the humeral head upon the glenoid (shoulder socket).
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