<Li> interclavicular ligament, superiorly </Li> <P> The lateral end is flat from above downward . It bears a facet for attachment to the acromion process of the scapula, forming the acromioclavicular joint . The area surrounding the joint gives an attachment to the joint capsule . The anterior border is concave forward and posterior border is convex backward . </P> <P> The shaft is divided into the medial two - thirds and the lateral one third . The medial part is thicker than the lateral . </P> <P> The medial two - thirds of the shaft has four surfaces and no borders . </P>

How would you describe the acromial end of the clavicle bone