Ligaments of the shoulder joint
The ratio of the area of the humeral head to that of the scapular fossa is 3:1. This may be why there is a glenoid labrum around the glenoid cavity, which is made of fibrocartilage and attempts to widen the glenoid cavity as much as possible.
Ligaments reinforcing the joint capsule are present on the superior and anterior surfaces of the shoulder joint, but not specifically on the posterior surface.
The coracohumeral ligament on the joint's superior surface is stretched between the lateral aspect of the coracoid process and the intertubercular sulcus (bicipital groove).
On the anterior surface of the joint, three glenohumeral ligaments are stretched between the superior anterior border of the glenoid labrum and the anatomic neck of the humerus.