What classification involves the movement of fingers only?

The classification that involves the movement of fingers only is known as Class I. This classification typically refers to movements that are localized to the fingers, primarily allowing for fine motor skills and precise control. This includes actions such as grasping, pinching, or manipulating small objects, which rely solely on finger movements without engagement of the wrist or forearm.

In contrast, other classifications would encompass broader ranges of motion or involve additional anatomical structures. For instance, Class II would include movements that engage the wrist in addition to the fingers, while Class III could further extend to include the forearm. Class IV would generally imply even greater complexity or range of movement that may incorporate larger muscle groups and multiple joints, going beyond just the fingers. Therefore, Class I stands out for its specificity to finger movement, making it the correct choice in this context.