ARTICULATES ONLY WITH THE CLAVICLE AND THE HUMERUS - acromial clavicular joint - synovial joint, planar (gliding), tied together with ligaments so very little motion. Gelohumeral joint between head of the humerous and the glenoid fossa. 2. BONE FLOATS OVER THE RIB CAGE. IT CAM BE MOVED ANTERIORLY, POSTERIORLY, SUPERIORLY, INFERIORLY, AND ROTATED.