This organ contains clumps of lymphoid tissue called (*)
One section of this organ is connected to the diaphragm by the ligament of Treitz, and the failure of this organ's omphalomesenteric duct to close after birth causes Meckel's diverticulitis. Brunner's glands secrete alkaline fluid into it. This organ contains clumps of lymphoid tissue called (*) Peyer's patches, and the liver and pancreas drain into it through the sphincter of Oddi. Enzymes are secreted in its crypts of Lieberkuhn, and mucosal secretions facilitate peristalsis in this organ, whose surface area is increased by fingerlike projections called villi. For 10 points, name this organ of the digestive system, the site of nutrient absorption.
One section of this organ is connected to the diaphragm by the ligament of Treitz, and the failure of this organ's omphalomesenteric duct to close after birth causes Meckel's diverticulitis.
small {intestine} [prompt on {intestine}; prompt on {jejunum}, {ileum}, or {duodenum}]