Johann Heinrich Lieberkühn was a German anatomist and physiologist born in 1711. He is best known for his work on the structure of the human digestive system, particularly the intestines. Lieberkühn's research contributed to the understanding of the gastrointestinal tract and its functions. He is also recognized for his discovery of the Lieberkühn crypts, which are small glandular structures located in the lining of the small intestine. These crypts play a crucial role in the secretion of intestinal juices and the regeneration of the intestinal lining. Lieberkühn's contributions significantly advanced the field of anatomy and physiology.