Lieberkühn crypts are small glandular structures located in the lining of the small intestine. They are named after the German anatomist Heinrich Lieberkühn, who described them in the 18th century. These crypts are responsible for producing intestinal juices, which aid in digestion and nutrient absorption. The cells within the Lieberkühn crypts include enterocytes, which absorb nutrients, and goblet cells, which secrete mucus to protect the intestinal lining. The crypts also contain Paneth cells, which play a role in immune defense by producing antimicrobial substances. Overall, Lieberkühn crypts are essential for maintaining gut health and function.