Overall the shoulder is rather simple, it consists of 3 main bones: the humorous and the pectoral girdle, which is the scapula and clavicle. Attached to the humorous is the head of the humorous which is attached to the glenoid cavity that is part of the pectoral girdle, this is the joint. The head of the humorous provides the large articular surface to connect with the shallow glenoid cavity. The joint is then stabilized by the surrounding muscles and tendons. The humorous is enclosed in tough fibrous, a connective tissue cover called the periosteum, continuous with the ligaments that travel across the shoulder. Periosteum contains blood vessels, these enter the bone and give off branches that go to osteocytes located in lacunae. The long part
