The crypts of Lieberkühn are small, tubular glands located in the lining of the intestine, particularly in the small intestine and large intestine. They are responsible for producing intestinal secretions, including enzymes and mucus, which aid in digestion and protect the intestinal lining. These crypts contain various types of cells, including goblet cells that secrete mucus and enterocytes that absorb nutrients. The crypts play a crucial role in maintaining the health of the intestinal environment and supporting the overall digestive process.