Thumb Abduction. The thumb abducts in the same plane the other fingers flex – a plane 90 degrees to the palm. Movement of the thumb away from the palm, but in the plane of the palm is referred to both as extension and radial abduction. It is palmar abduction that occurs only at the CMC joint.Click to see full answer. Correspondingly, what is thumb abduction?The motion of abduction is occurring at the 1st carpometacarpal (CMC) joint of the thumb. 1st CMC abduction is demonstrated from a position with the thumb resting on the palm to a position of the thumb moving as far away from the palm as possible as seen from a front or anterior view.Secondly, what are the movements of the thumb? The movements at each thumb joint are flexion and extension (called radial abduction in the CMCJ) and additional movements of anteposition, retroposition and opposition at the CMCJ, due to the saddle shape of the articulation. Moreover, what is palmar abduction? 1. The thumb’s MP and CMC joints abduct and adduct in a plane perpendicular to the palm. Some therapists also refer to abduction as “palmar abduction.”What is adduction vs abduction?Abduction moves the limb laterally away from the midline of the body, while adduction is the opposing movement that brings the limb toward the body or across the midline. Spreading the fingers or toes apart is also abduction, while bringing the fingers or toes together is adduction.

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