In spinal groove, radial nerve is accompanied by

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 Chaurasia's Human Anatomy , seventh edition , volume 1 , pg. no. 96 fig. Ref : B D Chaurasia's Human Anatomy , seventh edition , volume 1 , pg. no.74 ( fig. no. 6.11 )