Sphincters in the Human Body

Sphincters are circular muscles that open and close passages in the body.

1. Upper esophageal sphincter (UES)
2. Lower esophageal sphincter (LES)
3. Pyloric sphincter (connects stomach and intestine)
4. Sphincter of Oddi (at the exit of the bile duct and pancreatic duct into the duodenum)
5. Ileocecal sphincter (situated at the junction of the ileum, at the end of the small intestine and the colon, at the beginning of the large intestine).
6. Pupillary sphincters (eyes)
7. orbicularis oculi (eyelids)
8. Urethral sphincter
9. Inrernal anal sphincter
10. External anal sphincter