The joint is surrounded by a capsule attached to the edges of the articular surfaces of the bones, which is strengthened to form anterior and posterior ligaments. In addition there is a meniscus, or disc of fibro-cartilage, between the two articular surfaces.

Accessary Ligaments: Interclavicular, attached to the sternal end of the clavicle and the suprasternal notch. It is continuous with the one of the other side. This ligament prevents the end of the clavicle being raised up too much when the acromial end is depressed as in carrying heavy weights.

Rhomboid, attached to the under surface of the sternal end of the clavicle and the upper surface of the first costal cartilage; it limits the movements of the clavicle when the arms are raised over the head.

The synovial membrane lines the two joint cavities which are separated by the meniscus.

Acromio - Clavicular Joint, between the acromial end of the-clavicle and the acromion process of the scapula.

A gliding joint similar in movement and function to the sterno-clavicular joint. The two joints give elasticity and increased movement to the shoulder girdle.

A capsule surrounds the joint, which is strengthened to form superior and inferior ligaments. There is often a meniscus of fibro-cartilage to be found in this joint too, but not invariably.

Accessory Ligaments: Coraco-clavicular between the acromial end of the clavicle and the coracoid process of the scapula. It is in two parts, viz.Conoid - a triangular ligament attached by its apex to the upper surface of the coracoid process and by its base to the conoid tubercle of the clavicle.

Trapezoid - a ligament on the outer side of the conoid and attached to the upper surface of the coracoid process and to the oblique line from the conoid tubercle.