Shoulder Joint | |||
The shoulder joint, like the hip joint, is a ball and socket joint. It joins the arm to the torso. The ball is at the top of the humerus (the bone between the shoulder and the elbow), while the socket is part of the shoulder blade (which is called the scapula). It is acted on by a number of short muscles which run from the shoulder blade on to the humerus, together called the rotator cuff, and longer muscles such as the biceps which move both shoulder and elbow. The shoulder joint is contained within a capsule lined by a synovial membrane which produces a small amount of synovial fluid to lubricate movement. It allows a large range of movement: forwards and backwards as well as outwards and upwards.
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