# upper esophageal sphincter

> superior portion of the esophagus

**Wikidata**: [Q1407428](https://www.wikidata.org/wiki/Q1407428)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Upper_esophageal_sphincter)  
**Source**: https://4ort.xyz/entity/upper-esophageal-sphincter


## References

1. Freebase Data Dumps. 2013
2. UMLS 2023
3. Quora
4. KBpedia