<prompt> Lower lateral cutaneous nerve of arm is a branch ofRadial nerveAxillary nerveMedian nerveMusculocutaneous nerve  <response>: Lower lateral cutaneous nerve of arm C5 , C6 is a branch of radial nerve given off in the radial groove . It supplies the skin of the lower half of the lateral side of the arm. B D Chaurasia 7th edition Page no : 79 