This medium magnification
view of the colon shows, from top to bottom: 1)
the lumen, containing fecal matter; 2) the mucosa, containing crypts of Lieberkuhn,
lined by a simple columnar epithelium of absorptive cells and goblet cells;
the lamina propria; and the muscularis mucosae; and 3) a submucosa of loose
connective tissue.
