part_of part of part of intestine mucosa intestinal mucosa intestine organ mucosa mucous membrane of intestine bowel mucosa mucosa of organ of bowel intestine mucosa Mucosal layer that lines the intestine. mucosa of organ of intestine intestine mucous membrane bowel mucosa of organ mucous membrane of bowel mucosa of intestine bowel organ mucosa bowel mucous membrane mucosa of bowel organ mucosa of bowel tunica mucosa intestini intestine mucosa of organ organ mucosa of intestine wall of intestine gastrointestinal system mucosa