Abstract: Objective: To investigate the ultrasonic anatomy of brachial plexus and the advantages of brachial plexus block guided by
ultrasound. Methods: High frequency ultrasound was used in scanning the brachial plexus branches in 18 healthy volunteers with both
sides, and the longitudinal and transversal views were obtained, the advantages of brachial plexus block guided by ultrasound was
analysed. Results: High-frequency ultrasound can clearly show the position, course and anatomic relationship of normal brachial
plexus. Under the ultrasound-guided, the operation time of brachial plexus block is short and the success rate is high. Conclusion:
High-frequency ultrasound could clearly show the anatomic structure of the brachial plexus. Visualization block guided by ultrasound
is safe and reliable, and is worth clinic popularization and application.

Key words: brachial plexus, ultrasonic anatomy, ultrasound-guided block, advantages