Aim To investigate the dynamic changes of the P2X2/3 receptor in the rat trigeminal ganglion(TG) neurons with trigeminal neuralgia(TN) and its functions.Methods The behavioral observation and HE staining were performed to evaluate the CCI-ION model,and immunohistochemistry was used to measure the expression of P2X2/3 receptor in different observed periods.Results In the control group,P2X2/3 was detected in middle and small diameter neurons of TG.The P2X2/3 expression in TG neurons in all observed periods at...