The glenohumeral, the primary shoulder joint, is a ball-and-socket joint. It gets its name from the ball-like shape of the humerus, the top bone of the upper arm. The shoulder socket, which is formed by this ball fitting into the shoulder blade bone, allows your shoulder to move freely. However, in comparison to other ball-and-socket joints like the hip, the shoulder socket is incredibly tiny. It is kept together and managed by a layer of muscles that are attached to the bones by robust bands known as tendons. Although they support the joint's motion and form a capsule surrounding it, these muscles and tendons also increase the joint's susceptibility to dislocation. The synovium, which is located inside the capsule, secretes a fluid that lubricates the joint and preserves the cartilage. The cartilage rests in between the bones of your shoulder joints to prevent them from grinding against one another and helps shield your bones from impact damage.
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