Sphincters are circular muscles that open and close passages in the body.
- Upper esophageal sphincter (UES)
- Lower esophageal sphincter (LES)
- Pyloric sphincter (connects stomach and intestine)
- Sphincter of Oddi (at the exit of the bile duct and pancreatic duct into the duodenum)
- 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).
- Pupillary sphincters (eyes)
- orbicularis oculi (eyelids)
- Urethral sphincter
- Inrernal anal sphincter
- External anal sphincter
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