[Neuropharmacological study of the internal anal sphincter in an animal model].
D001003:Anal Canal / Q000033:anatomy & histology* / Q000187:drug effects / Q000502:physiology; D000818:Animals; D006801:Humans; D008365:Manometry / Q000295:instrumentation / Q000379:methods; D008954:Models, Biological; D011312:Pressure; D051381:Rats