NCIt definition : A large nerve that arises from the brachial plexus and enervates the extensor muscles
and skin of the entire upper limb's posterior aspect.;
Alternative definition : CDISC: A nerve extending from the brachial plexus traveling the length of the arm/forelimb,
which innervates the extensor muscles of the elbow, carpus and phalanges, as well
as the skin on the dorsal aspect of the carpus, metacarpus and digits.;