Updated: April 22, 2011
The Basics
Gastrointestinal Disorders
Cleveland Clinic
Anatomy
Your Digestive System and How it Works National Institute of Diabetes and Digestive and Kidney Diseases (also in Spanish)
Glossaries
Digestive Disease Dictionary National Institute of Diabetes and Digestive and Kidney Diseases
Symptoms
Symptoms
Merck Manual, Home Edition
Children and the GI System
Your Stomach & Digestive System Nemours Foundation (also in Spanish) 
Teens and the GI System
The Digestive System Nemours Foundation (also in Spanish) 
