1. Laboratory of Veterinary Anatomy, The United Graduate School of Veterinary Science, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
2. Laboratory of Veterinary Anatomy, Faculty of Applied Biological Sciences, Gifu University, Gifu 501-1193, Japan
3. Laboratory of Veterinary Physiology, The Joint Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan
4. Department of Anatomy and Embryology, Ehime University Graduate School of Medicine, Toon, Ehime 791-0295, Japan
5. Laboratory of Veterinary Anatomy, The Joint Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan