NCIt definition : A muscle group in the hand that controls radial extension and abduction or deviation
of the wrist; either the extensor carpi radialis brevis muscle, which originates at
the lateral epicondyle of the humerus and inserts at the third metacarpal bone, or
the extensor carpi radialis longus muscle, which originates at the lateral supracondylar
ridge of the humerus and inserts at the back base of the second metacarpal bone.;
Alternative definition : CDISC: A group of two muscles of the hand, the extensor carpi radialis brevis and
extensor carpi radialis longus. Primary function is radial extension and abduction
or deviation of the wrist.;