参考文献:Vicky Aspinall. Anatomy and Physiology of the Dog and Cat 8. The Digestive System. Veterinary Nursing Journal，2004，19:Nickel R.， Schummer A.， Seiferle E.， Sack W.O. Digestive System. In: The Viscera of the Domestic Mammals. Springer， New York， NY. 见原文链接。
