Abstract The supraclavicular approach to the brachial plexus is probably the most useful and safest method of anesthetizing this area which has been suggested so far. It is especially well adapted for operations which are confined to the arm, forearm and hand, where it is desirable that the patient have control of motor function. The method is successful in 75 to 80 per cent of cases, provided there is close adherence to the proper technique. It should not be used in cases in which there is obvious disease of the brachial plexus or suppuration in the supraclavicular region. The most serious complication which can result from this type of anesthesia is permanent injury to the brachial plexus; however, with careful technique trauma to these nerve trunks will be minimal.