1. Department of Veterinary Anatomy; College of Bioresource Sciences, Nihon University; 1866 Kameino; Fujisawa; Kanagawa; 252-0880; Japan
2. Laboratory of Anatomy and Histochemistry, Faculty of Rehabilitation Science; Nagoya Gakuin University; 1350 Kamishinanocho; Seto; Aichi; 480-1298; Japan
3. Institute for Anatomy; University of Veterinary Medicine Hannover Foundation; 30173; Hannover; Germany