The large intestine, or colon, is the terminal portion of the gastrointestinal tract, extending from the ileocecal junction through the cecum, ascending, transverse, descending, and sigmoid colon to the rectum and anal canal. Its principal physiological roles are the reabsorption of water and electrolytes from indig…
The large intestine, or colon, is the terminal portion of the gastrointestinal tract, extending from the ileocecal junction through the cecum, ascending, transverse, descending, and sigmoid colon to the rectum and anal canal. Its principal physiological roles are the reabsorption of water and electrolytes from indigestible residue, the formation and storage of feces, and the fermentation of dietary fiber by a dense resident microbiota that yields short-chain fatty acids and contributes to host metabolism and mucosal health. Experimental work on the histomorphology of the small and large intestines and stomach, including studies using plant extracts in animal models, examines how the colonic wall and its epithelium respond to dietary and pharmacological exposures. The interplay between nutrition and gut microbiota is central to colonic function, as the composition of the intestinal flora influences digestion, immune regulation, and disorders such as small intestinal bacterial overgrowth that affect transit and absorption along the bowel. Surgical correction of digestive-system refluxes and motility disturbances further illustrates the clinical importance of large-bowel anatomy and physiology. Maintaining the balance of microbial communities and mucosal integrity in the large intestine is thus integral to overall digestive health and to the pathogenesis of colorectal disease.
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