Where should the central ray be directed for the internal rotation of the shoulder?

Directing the central ray through the glenohumeral (GH) joint is essential during the internal rotation of the shoulder. This positioning targets the joint itself, ensuring that the images captured provide a clear view of the relationship between the humeral head and the glenoid cavity. The glenohumeral joint is where the humerus articulates with the scapula, thus centralizing the ray at this point allows for optimal visualization of potential pathologies and anatomical details.

Other options, like the acromion process, the center of the clavicle, and the lateral border of the scapula, do not provide the same direct view of the shoulder joint. While these landmarks may be important in other imaging contexts or projections, they would not effectively demonstrate the specific features and conditions of the glenohumeral joint as an internal rotation view requires.