Axillary block anatomy and ultrasound transducer position

The axillary block anesthetizes the nerves of the brachial plexus at the level of the individual nerves (ie, median, radial, and ulnar), where they surround the axillary artery. The placement of the ultrasound transducer is shown by the rectangle in this graphic. For further information refer to UpToDate content on axillary block technique.