<prompt> Adduction of thumb occurs at:Inter carpal jointMCP jointCarpometacarpal jointInter phalangeal joint  <response>: C i.e. Carpometacarpal joint 1st carpometacarpal joint cmj is the only cmj with seperate joint cavity so the movements are much free. Flexion- extension in the plane of palm, adduction - abduction at right angles to the plane of palm, opposition circumduction, movements of thumbQ take place at 1st CM Joint. 