Material and Methods: Choosing 30 normal cadaver heads,with MRscanning in coronal section as 5mm. ,the scanning line is perpendicular tothe plane of Os sphenoidale as the base line.

• 材料与方法：选取30例成年人正常头颅标本，以蝶平面正中线之延线的垂线为基线行冠状位MRI扫描，获得5mm层厚的颅脑连续冠状面MRI图像。