In small intestine, the wall of duodenum contains crypts of Leiberkuhn (intestinal glands) and Brunner’s glands (duodenal glands). The intestinal juice or succus entericus is secreted by crypts of Leiberkuhn. Pancreatic juice contains trypsin, for digesting protein and pancreatic amylase (amylopsin) for breakdown of starch and pancreatic lipase (steapsin) acting upon emulsified fats.