<prompt> In spinal groove, radial nerve is accompanied byMedian nerveAxillary aeryProfunda brachii aeryMusculocutaneous nerve  <response>: radial nerve- At the beginning of the brachial aery, the radial nerve lies posterior to the aery. Soon the nerve leaves the aery, by entering the radial spiral groov on the back of the arm where it is accompanied by th profunda brachii aery. Ref : B D Chaurasias Human Anatomy , seventh edition , volume 1 , pg. no. 96 fig. Ref : B D Chaurasias Human Anatomy , seventh edition , volume 1 , pg. no.74 fig. no. 6.11 