which is the longest portion of the alimentary canal?
Human Anatomy Â» Digestive System Â» Small Intestine. Small intestine is the longest part of alimentary canal. It extends from the pylorus of the stomach to the junction between cecum and ileum. Much of digestion and absorption of food takes place in the small intestine. The small intestine is divided into three parts: Duodenum, Jejunum and Ileum.