title: Endosonography of the anal sphincter muscles in healthy volunteers and in patients with defecation disorders.
authors.forename: M B
authors.initials: MB
authors.lastname: Nielsen
mesh_terms: D001003:Anal Canal / Q000000981:diagnostic imaging* / Q000293:injuries / Q000503:physiopathology; D003248:Constipation / Q000000981:diagnostic imaging* / Q000503:physiopathology; D003672:Defecation / Q000502:physiology*; D019160:Endosonography / Q000295:instrumentation*; D005242:Fecal Incontinence / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D006801:Humans; D007415:Intestinal Obstruction / Q000000981:diagnostic imaging / Q000503:physiopathology; D008297:Male; D011247:Pregnancy; D012002:Rectal Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology