title: The riddle of the sphincters.
mesh_terms: D000375:Aging; D001003:Anal Canal / Q000033:anatomy & histology* / Q000294:innervation; D001006:Anus, Imperforate / Q000503:physiopathology; D003109:Colonic Diseases, Functional / Q000503:physiopathology; D003672:Defecation; D005242:Fecal Incontinence / Q000503:physiopathology*; D005260:Female; D005401:Fissure in Ano / Q000503:physiopathology; D006484:Hemorrhoids / Q000503:physiopathology; D006801:Humans; D007223:Infant; D007410:Intestinal Diseases / Q000175:diagnosis / Q000628:therapy; D008531:Megacolon / Q000503:physiopathology; D009119:Muscle Contraction; D009129:Muscle Tonus; D009130:Muscle, Smooth / Q000033:anatomy & histology; D009132:Muscles / Q000502:physiology* / Q000503:physiopathology; D009434:Neural Pathways / Q000502:physiology; D009475:Neurons, Afferent / Q000502:physiology; D011312:Pressure; D012002:Rectal Diseases / Q000503:physiopathology; D012005:Rectal Prolapse / Q000503:physiopathology; D012007:Rectum / Q000033:anatomy & histology* / Q000294:innervation; D012018:Reflex; D013314:Stress, Mechanical