Objective To observe the effect of Buyang Huanwu decoction(BYHWD) and its four kinds of active fractions(alkaloid, glycoside, polysaccharide and aglycone) on cerebral motor cortex in spinal cord injury(SCI) rats, and then explore the proper mechanism of the neuroprotection. Methods A total of 48 adult Sprague-Dawley rats were randomly divided into eight groups: control group, sham-operation group, SCI group, BYHWD group, alkaloid group, glycoside group,polysaccharide group and aglycone group(n=6). SCI model was performed by cutting the...