noun
- An internal ring of smooth muscle formed by circular fibers of the rectum. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). musculus sphincter ani internus. Retrieved October 1, 2026, from http://smartdefine.org/musculus_sphincter_ani_internus/definitions/1213491 |
| Chicago | WordNet. 2010. "musculus sphincter ani internus" http://smartdefine.org/musculus_sphincter_ani_internus/definitions/1213491 (accessed October 1, 2026). |
| Harvard | WordNet 2010, musculus sphincter ani internus, Smart Define, viewed 1 October, 2026, <http://smartdefine.org/musculus_sphincter_ani_internus/definitions/1213491>. |
| MLA | WordNet. "musculus sphincter ani internus" 23 October 2010. Web. 1 October 2026. <http://smartdefine.org/musculus_sphincter_ani_internus/definitions/1213491> |