Lubowski, D Z Effect of sympathetic innervation on the human internal anal sphincter. [electronic resource] - International journal of colorectal disease Aug 1991 - 175-6 p. digital Publication Type: Comment; Letter ISSN: 0179-1958 Standard No.: 10.1007/BF00341242 doi Subjects--Topical Terms: Anal Canal--innervationHumansMuscle Contraction--physiology