(sū'pĕr-fish'ăl branch rā'dē-ăl nĕrv) Cutaneous terminal branch (with deep branch) that runs under cover of brachioradialis muscle to wrist, then supplies skin of proximal portion of the dorsal aspects of thumb, index, middle, and lateral half of ring fingers and proximal portion of dorsum of hand. Synonym(s): ramus superficialis nervi radialis.