Fig. 1From: Ultrasound-guided supraclavicular block versus Bier block for emergency reduction of upper limb injuries: a protocol for an open-label, non-inferiority, randomised controlled trialUltrasound-guided supraclavicular block (UGSCB): Left panel illustrating ultrasound probe and needle placement. Right panel showing ultrasound anatomy of the supraclavicular fossa, with superimposed needle trajectories for UGSCB. Abbreviations: BP-Brachial plexus, SA-Subclavian artery, SCM-sternocleidomastoidBack to article page