Which description best matches circumduction?

• A. Rotation around a fixed axis.
• B. Limb bending without moving the joints.
• C. A straight-line movement.
• D. Cone-shaped movement with the distal end moving in a circle and the proximal end relatively fixed.

Answer: (D)

Circumduction creates a cone-shaped arc in space, because the limb moves through multiple planes at the joint, combining flexion, abduction, extension, and adduction. As this sequence unfolds, the distal end (like the hand or foot) traces a circle, while the proximal part near the joint stays relatively fixed as the pivot point.

This differs from simple rotation, which is turning around a single fixed axis without the distal end following a circular path in space. It also isn’t just bending the limb without moving the joint, nor is it a straight-line (linear) movement of the limb. The characteristic cone-shaped path with the distal end circling around the joint matches circumduction.