Succus entericus is a term used for

Succus entericus refers to the digestive juice of intestine. It is the alkaline secretion produced by the intestinal glands in the wall of the duodenum. It consists of water, mucoproteins, and hydrogen carbonate ions. It helps to neutralize the highly acidic and proteolytic chyme which enters the small intestine from the stomach, and thus protects the duodenum from damage.