Anatomical Divisions of the Small Intestines Duodenum Jejunum and Ileum Diagram

Small intestine divisions: duodenum (C-shaped, retroperitoneal, receives bile/pancreatic juice), jejunum (proximal 2/5, longer vasa recta, taller plicae), ileum (distal 3/5, more arcades, Peyer’s patches). They absorb nutrients progressively.