The tubules, mainly proximal convoluted, are lined by a single layer of cuboidal or low columnar epithelium. The papilla is surfaced by transitional epithelium. The image of jejunum shows mucosa and submucosa. The surface is lined by mucus producing goblet cells. The villous pattern is pronounced, and there are many crypts of Lieberkuhn.
Lymphocytes are present in the lamina propria.