Brachial plexus has complex nerve structure and tortuous walking

which controls the movement and sensation of upper limbs and shoulders.At present

the injury of brachial plexus is increasing year by year.How to make timely and accurately diagnosis of the injury of brachial plexus and clearly distinguish pre-and post-ganglion injuries before the operation have been the hot spot of clinical research.This paper reviews the progress of high-frequency ultrasound in the diagnosis of brachial plexus neuropathy.