It's of importance to anesthesiologist and surgeon to understand clearly the anatomy and relationship to artery of brachial plexus. Aim: To define the innervation and the relationship to artery of brachial plexus on autopsy. Result: The present study was done on 15 cadavers to study 30 brachial plexuses. C5 and C6 fuses to form the supperior trunk. There didn't have communication between C4 - C5 nerve (100 percent) and C5 - C6 nerve (93,3 percent). C8 and T1 join to form the inferior trunk (96,67 percent). The relation between brachial plexus and first part of brachial artery, the supperior trunk was at 11 o'clock (93,3 percent), middle and inferior trunk was at 10 o'clock (93,3 percent). At the second part of brachial artery, lateral and medial cord were at 9 o'clock, 100 percent of posterior cord was at 7 o'clock. The third part, radial and ulnar was at 11 o'clock (96,67 percent). Conclusion: Knowledge of variation is of immense importance during surgical exploration of axilla and arm region, during nerve block, during internal fixation.