Figure 1 - Anatomy of the esophagogastric junction.
From the following article
Sphincter mechanisms at the lower end of the esophagus
Ravinder K. Mittal and Raj K. Goyal
GI Motility online (2006)
doi:10.1038/gimo14
The lower esophageal sphincter and the crural diaphragm constitute the intrinsic and extrinsic sphincter, respectively. The two sphincters are anatomically superimposed on each other and are anchored by the phrenoesophageal ligament. (Source: Mittal and Balaban.2 Copyright © 1997, Massachusetts Medical Society.)
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