adducted thumbs Clasped thumbs, caused by absence of the extensor pollicis longus and/or brevis muscles to the thumb. When associated with mental retardation, it is part of an X-linked syndrome that affects mainly boys. See MASA syndrome.
adducted thumbs Clasped thumbs, caused by absence of the extensor pollicis longus and/or brevis muscles to the thumb. When associated with mental retardation, it is part of an X-linked syndrome that affects mainly boys. See MASA syndrome.