Which of the following are the primary joints of the shoulder?

The primary joints of the shoulder are indeed the sternoclavicular, acromioclavicular, and glenohumeral joints.

The sternoclavicular joint serves as the connection point between the upper limb and the trunk, allowing for movement and stability of the shoulder. Meanwhile, the acromioclavicular joint is located at the top of the shoulder and plays a crucial role in facilitating the arm's elevation and rotational movements. Lastly, the glenohumeral joint, which is the primary ball-and-socket joint of the shoulder, provides a wide range of motion, enabling various movements such as lifting, throwing, and reaching.

These three joints work together to allow for the complex movements associated with shoulder function, including stability and mobility, which is why they are considered the primary joints of the shoulder.