Motion around the longitudinal axis of a limb is called what?

Motion around the longitudinal axis of a limb is referred to as rotation. This type of movement involves turning the limb around its own axis, allowing for various actions, such as twisting or pivoting. For example, when you rotate your arm, the forearm moves around the axis of the humerus.

The other types of movements listed do not specifically describe this particular motion. Circumduction involves a circular movement that combines flexion, extension, abduction, and adduction, effectively creating a cone shape. Supination and pronation refer specifically to the rotational movements of the forearm and foot—supination is the outward rotation (turning the palm up), while pronation is the inward rotation (turning the palm down). Therefore, the term that accurately describes motion around the longitudinal axis of a limb is rotation.