*Masaaki Yoshikawa¹, Koichiro Sumi², Emiko Sano², Hirotsugu Hino³, Yoichi Sumi¹, Isumi Toda¹, Mamoru Uemura¹, Hiroyuki Hara³, Atsuo Yoshino² (1. Dept of Anat, Osaka Dent Univ, Osaka, Japan, 2. Div of Neurosurg, Dept of Neurol Surg, Nihon Univ Sch of Med, Tokyo, Japan , 3. Div of Anat Sci, Dept of Funct Morphol, Nihon Univ Sch of Med, Tokyo, Japan )