Crypts of Leiberkuhn or intestinal glands are present in the duodenum and ileum (parts of small intestine) only. These are formed by the folding of lamina propria and secrete succus entericus, $i.e.,$ intestinal juice.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.