Ji Won Oh1,2, Hyunsu Lee3, Jae-Ho Lee4. 1. Department of Anatomy, School of Medicine, Kyungpook National University, Daegu, Korea. 2. Bio-medical Research Institute, Kyungpook National University Hospital, Daegu, Korea. 3. Department of Anatomy, School of Medicine, Keimyung University, 2800, Dalgubeoldaero, Dalseo-Gu, Daegu, Republic of Korea. 4. Department of Anatomy, School of Medicine, Keimyung University, 2800, Dalgubeoldaero, Dalseo-Gu, Daegu, Republic of Korea. anato82@dsmc.or.kr.