For small peripheral nerves

traditional imaging techniques such as CT and MRI are difficult to display in real time.With the advancement of ultrasound technology and the increasing resolution of ultrasound imaging

it is possible to observe some small nerves by high-frequency ultrasound and gradually apply it in the diagnosis and differential diagnosis of various diseases.The anatomy of these small nerves by ultrasound imaging can provide accurately guidance for nerve block.In addition

the changes of parameters such as nerve cross-sectional area

echo and blood flow signals can provide a basis for diagnosis and evaluation of the efficacy of various diseases.This article reviews high-frequency ultrasound technology of various small nerves and related diagnosis and its application status in nerve block.