A plexus of autonomic nerve fibers within the wall of the digestive tube, and made up of the submucosal, myenteric, and subserosal plexuses; it contains visceral afferent fibers, sympathetic postganglionic fibers, parasympathetic preganglionic and postganglionic fibers, and parasympathetic postganglionic cell bodies. [ http://purl.obolibrary.org/obo/BTO_0002437 ]