The adductor pollicis is a fan-shaped muscle composed of two parts, or heads: the oblique head and the transverse head. To feel the adductor pollicis muscle, spread your fingers and hold your palm flat and facing upwards. Place two fingers in the web space between your thumb and the base joint of your index finger. Move your fingers down to just above the fleshy part of your hand below your thumb. Adduct your thumb by bringing it closer to the palm and into its resting position, parallel to your fingers — the muscle contracting beneath your fingers with this movement is the adductor pollicis.
Thumb Injuries: The Complete Guide to Diagnosing your Thumb Pain
Moving the limb or hand laterally away from the body, or extending the fingers of the hands or feet, is an abduction. The adduction brings the limb or hand to or through the midline of the body, or join the fingers of the hands or feet. Circumvallation is the movement of the limb, hand or fingers in a circular pattern, using the sequential combination of movements of flexion, adduction, extension and abduction. While all body systems contain many mysteries, the way our bodies move is fascinating. Just think of all the ways you can move! Of course, with all these possibilities, doctors, physical fitness professionals and researchers need a common language to describe the movements of our bodies.
Adductor pollicis muscle
Synovial joints allow the body a tremendous range of movements. Each movement at a synovial joint results from the contraction or relaxation of the muscles that are attached to the bones on either side of the articulation. The type of movement that can be produced at a synovial joint is determined by its structural type.
The thumb plays a crucial role in basic hand function. However, the kinematics of its entire articular chain have not yet been quantified. Such investigation is essential to improve our understanding of thumb function and to develop better strategies to treat thumb joint pathologies. The primary objective of this study is to quantify the in vivo kinematics of the trapeziometacarpal TMC and scaphotrapezial ST joints during flexion and adduction of the thumb.