Succus entericus is the technical Latin term for the intestinal juice — the mixture of secretions produced by the glands of the small intestine wall. It contains water, mucus, and a battery of enzymes that complete digestion: peptidases that finish breaking down proteins, disaccharidases such as lactase, sucrase, and maltase that split sugars into absorbable single units, and lipases that continue fat digestion. Bicarbonate in the secretion helps neutralise the acidic chyme arriving from the stomach, protecting the intestinal lining and creating the right pH for the enzymes to work. The term belongs to classical physiology and is rarely used in modern clinical writing, where intestinal secretions will do.