Objective To study the asymmetry of medulla on the sectional plane to support the way of localizing gyris by the neurapophysis,and to enrich the anatomical knowledge about the telencephalic sectional plane.Methods Slected 30 adult normal head specimens.Head specimens saw cutting were made through the planum sphenoidale till the surface of the brain were marked.Colored the different gyris with different colors so as to distinguish.Then cut the brain parallel to the marked line to make brain slices of 6 mm.Observed the corresponding neural process by different staining of brain slices.The number and direction of neurapophysis branches of the corresponding neurapophysis were observed.And these data were statistically analyzed and processed.Results On the telencephalic sectional planes,most of the corresponding neurapophysis of gyrus were symmertrical in the number and direction of neurapophysis branches.Conclusion It is reliable and practical to localize gyris with neurapophysis on telencephalic sectional planes.