When you abduct your arm, movement at the sternoclavicular joint includes __________?

 When you abduct your arm, movement at the sternoclavicular (SC) joint includes elevation and slight upward rotation of the clavicle. The sternoclavicular joint is a saddle-type joint that connects the clavicle (collarbone) to the sternum (breastbone) at the base of the neck. As the arm moves away from the body in the frontal plane passing through a range of motion from 0 degrees (arm by the side) to 180 degrees (arm straight up), the SC joint accommodates this movement by allowing the clavicle to move accordingly.

During the initial phase of arm abduction, the clavicle elevates at the SC joint. Continued abduction also involves rotation of the clavicle, where its sternal end rotates posteriorly and upward, increasing the angle at which the shoulder blade (scapula) can tilt upward on the thorax. This rotation is crucial for full abduction of the arm, allowing the movement to occur smoothly and efficiently and enabling a greater range of motion at the shoulder.