Objective To compare the effects of different insertion depths of nylon thread on the establishment of rat model of middle cerebral artery occlusion(MCAO).Methods The rats were randomly divided into four groups according to different insertion depths of the nylon thread:(1) 0.8 cm group;(2) 1.3 cm group;(3) 1.8 cm group;(4) 2.2 cm group.The body weight and modified neurological severity scores were tested before MCAO,24 h and 48 h after MCAO.All rats were killed at 48 h after MCAO.The brains were removed an...