Which term describes movement around the long axis of a bone?

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Movement around the long axis of a bone is rotation. The long axis runs along the length of the bone, and rotation describes turning around that axis, such as turning a limb so the front faces inward or outward. Examples include rotating the neck side to side or turning the arm at the shoulder. The other terms describe different kinds of motion: circumduction is a circular, cone-shaped path produced by combining several movements; extension straightens a joint to increase its angle; pronation is a specific rotation of the forearm that turns the palm downward. Rotation is the general term that covers turning around the bone’s own axis.