Which term describes movement in space that circumscribes a circle or cone about a joint?

• A. Flexion
• B. Extension
• C. Circumduction
• D. Elevation

Answer: (C)

Circumduction describes a circular trace in space around a joint. It combines multiple movements—flexion, abduction, extension, and adduction—so the distal segment (like the hand) moves along a circular path, forming a cone around the joint axis while the proximal segment stays near the joint. This is different from flexion, which bends the joint to reduce the angle in a single plane, or extension, which increases that angle. Elevation is a upward movement in a different plane (such as of the scapula or mandible) and does not produce a circular path around the joint. An example is the shoulder performing circumduction, where the hand swings in a circular trajectory while the arm goes through a sequence of movements.