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Patient position: Supine, with the head turned away from the side to be blocked.

The arm should be abducted to 90 degrees and the elbow flexed. This maneuver raises the clavicle, reduces the depth from the skin to the plexus, and substantially facilitates visualization of the pectoralis muscles as well as the cords of the brachial plexus.

External landmarks: The clavicle and coracoid process.

Patient position for an infraclavicular brachial plexus block.