ultrastructural analyses of the lymphatic and capillary microcirculations of the mucosal regions of the colon and ileum indicate that , relative to the small intestine , the colonic mucosa is characterized by ( a ) lymphatic vessels that are smaller in caliber and do not extend beyond the bottom third of the mucosa and ( b ) blood capillaries that are situated half as far from the base of the epithelial cells .
C0020885
ileum
C0021852
small intestine