Where should the central ray be directed for a lateral hand x-ray?

The central ray for a lateral hand x-ray should be directed through the metacarpal heads because this positioning allows for a clear imaging of the entire hand structure. The metacarpal heads are the distal ends of the metacarpal bones located just before the fingers. Directing the central ray here ensures that the x-ray captures the alignment, joint spaces, and any pathology present in both the metacarpals and phalanges, providing a comprehensive view of the hand in its lateral position. This is essential for accurate diagnosis and assessment of any injuries or conditions affecting the hand.