Upper esophageal sphincter open — Free Physiology Illustration | GPAI | GPAI

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Upper esophageal sphincter open — Free Physiology Illustration | GPAI | GPAI

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Upper esophageal sphincter open

Upper esophageal sphincter open

Physiology

Upper esophageal sphincter open

A ring of pink muscle at the top of the esophagus with the central lumen widened, the muscular rim appearing stretched apart.

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