part of part of innervates innervates branching part of branching part of Homo sapiens arm radial nerve http://upload.wikimedia.org/wikipedia/commons/e/e2/Gray818.png A nerve that supplies the upper limb, including the triceps brachii muscle of the arm, as well as all 12 muscles in the posterior osteofascial compartment of the forearm, as well as the associated joints and overlying skin. EHDAA2:0001584 EHDAA:5650 UMLS:C0034518 EMAPA:17278 FMA:37069 nervus radialis GAID:845 UBERON:0001492 SCTID:181011002 VHOG:0000896 MESH:D011826 NCIT:C52812 Wikipedia:Radial_nerve MA:0001171 triceps brachii brachial nerve plexus skin of forearm arm nerve musculature of forelimb zeugopod