hemorrhoids external. rectum structure. intestines. colon. internal hemorrhoidal node. infographics.

anal anatomy anus arterio biology body bowel canal care colon constipation cross diagram digestion digestive disease external fissure fistula genitourinary gland health hemorrhoid hemorrhoidal hemorrhoidectomy human illustration inflamed inflammation internal intestine issues medical medicine pain part people piles problem rectal rectum renal science section sphincter swollen system treatment vascular venous